From a5f1c4bc2c1260ebbf3e55c8a75d4637409befc1 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E5=BE=90=E6=B0=B8=E6=B7=B3?= <2678158018@qq.com> Date: Thu, 19 Oct 2023 12:41:05 +0800 Subject: [PATCH 1/4] =?UTF-8?q?=E7=AC=AC=E5=8D=81=E4=B9=9D=E6=AC=A1?= =?UTF-8?q?=E7=AC=94=E8=AE=B0?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../20231018\347\254\224\350\256\260.md" | 454 ++++++++++++++++++ .../\346\227\266\351\227\264.png" | Bin 0 -> 1091 bytes 2 files changed, 454 insertions(+) create mode 100644 "18 \345\276\220\346\260\270\346\267\263/20231018\347\254\224\350\256\260.md" create mode 100644 "18 \345\276\220\346\260\270\346\267\263/\346\227\266\351\227\264.png" diff --git "a/18 \345\276\220\346\260\270\346\267\263/20231018\347\254\224\350\256\260.md" "b/18 \345\276\220\346\260\270\346\267\263/20231018\347\254\224\350\256\260.md" new file mode 100644 index 0000000..a473a57 --- /dev/null +++ "b/18 \345\276\220\346\260\270\346\267\263/20231018\347\254\224\350\256\260.md" @@ -0,0 +1,454 @@ +# 索引 + +-- 建立一个数据和表（id,name,phone,sex,hobby），想办法插入10万条数据， + +--案例 + +执行查询文件tb_user.sql，数据准备好了之后，完成如下需求： + +1. name字段为姓名字段，该字段的值可能会重复，为该字段创建索引。 +2. phone手机号字段的值，是非空，且唯一的，为该字段创建唯一索引。 +3. 为profession、age、status创建联合索引。 +4. 为email建立合适的索引来提升查询效率。 +5. 查看tb_user表的所有的索引数据。 + +

运行时间 + + + +![时间](D:\数据库高级作业\database-advanced\18 徐永淳\时间.png) + +#### 什么是索引？ + +索引（index）是帮助MySQL**高效获取数据**的数据结构。 + + + +## 索引的优点* 提升select 速度 90% + +提高数据检索的效率，**降低数据库的IO成本** + +通过索引列对数据进行排序，降低mysql对数据自动排序的成本，**降低CPU的消耗** + +#### 缺点(忽略不计)： 降低了 INSERT、UPDATE、DELETE 速度 + +索引列也是要占用空间的。索引大大提高了查询效率，同时却也降低更新表的速度， + +如对表进行INSERT、UPDATE、DELETE时，需要对索引进行维护，效率降低。 + + + +## 索引的分类 + +单列索引：一个索引建立在一个列上，一张表可以拥有多个单列索引 + +- 普通索引：单纯地为了提高搜索效率 index +- 唯一索引：unique index，唯一索引只能够建立在数据不重复的列上 ,唯一约束 ，不能重复，可以null，有多个唯一索引 +- 主键索引：primary key唯一性、非空，主键约束 ，不能重复，也不能null，一个只能有一个主键 + +联合索引：可以同时为多个列创建一个索引 + +全文索引（了解） + + + +## 单列索引 + +#### 创建索引（普通索引） + +这是最基本的索引，它没有任何限制。它有以下几种创建方式： + +-- 方式一和二是给现成表加索引 + +方式一：直接在已有表中创建索引 + +```sql +create index 索引名 on 表名(列名) -- 直接删除索引 drop index 索引名 on 表名; 这种不能用来创建主键索引 +``` + +方式二：修改表结构追加普通索引 + +```sql +alter table 表名 add index 索引名(列名); -- 修改表结构删除索引 alter table 表名 drop index 索引名; +``` + +方式三：创建表的时候直接指定 + +```sql +create table 表名( + aaa int primary key, + bbb varchar(20), + index 索引名 (列名) -- 以这种模式定义的索引，可以不指定索引名称。 + primary key(列名) +); +``` + + + + + +#### 查看表的索引 + +```sql +show index from 表名; +``` + +可以查看到创建在表上的所有索引名称。 + + + +#### 删除索引 + +```sql +drop index 索引名 on 表名; +``` + +并且删除表时，会一并删除表上的全部索引。 + +```sql +alter table 表名 drop index 索引名; +``` + + + +#### 唯一索引:建立列的唯一约束时，会自动创建唯一的索引，索引名就是列名 + +它与前面的普通索引类似，不同的就是：索引列的值必须唯一，但允许有空值。如果是组合索引，则列值的组合必须唯一。它有以下几种创建方式 + +```mysql +create unique index 索引名 on 表名(列名); -- 创建普通索引的基础上。多了unique关键字 +``` + +​ 在已存在的表上追加唯一索引 + +```mysql +alter table 表名 add unique 索引名 (列名) +``` + +​ 创建表的时候直接指定 + +```mysql +create table tc_9( + aaa int primary key, + bbb varchar(20), + unique [INDEX] 索引名 (列名) -- 唯一索引，一定有索引名，index 可以省略 +); + +-- 唯一索引和唯一约束 语法还是 有些区别 +create table tc_9( + aaa int primary key, + bbb varchar(20), + tel char(11), -- unique not null, + unique (tel) -- unique(列名) -- 约束是没有 索引名 和 index 关键字的 +); +``` + +**删除唯一索引的方法与删除普通索引相同。** + + + + + + + + +#### 主键索引 与 index 关键字没有关系 + +主键索引：它是一种特殊的唯一索引，不允许有空值。一般是在建表的时候指定了主键，就会创建主键索引， CREATE INDEX不能用来创建主键索引，使用 ALTER TABLE来代替。 + +创建主键索引，就是创建主键约束 + +```sql +drop table if exists tc_10; +create table tc_10( + aaa int primary key, + bbb varchar(20), + ccc datetime +); +create table tc_10( + aaa int, + bbb varchar(20), + ccc datetime, + primary key(aaa) +); +create table tc_10( + aaa int, + bbb varchar(20), + ccc datetime +); +alter table tc_10 add primary key(aaa); +``` + + + +删除主键 + +可以使用 ALTER 命令删除主键： index + +```sql +alter table 表名 drop primary key; +``` + +删除主键时只需指定PRIMARY KEY，但在删除索引时，你必须知道索引名。而不能使用删除普通索引的方法来删除主键索引。 + +```sql +-- 这都是错误的。 +drop index PRIMARY on tc_10; +drop primary key on tc_10; +``` + + + +## 联合索引 + +```sql +create index 索引名 on 表名(列名1,列名2....) -- 普通的联合索引 +create unique index 索引名 on 表名(列名1,列名2....) -- 联合唯一索引 +``` + +*执行原则：最左前缀法则 + + + +#### 案例 + +执行查询文件tb_user.sql，数据准备好了之后，完成如下需求： + +1. name字段为姓名字段，该字段的值可能会重复，为该字段创建索引。 +2. phone手机号字段的值，是非空，且唯一的，为该字段创建唯一索引。 +3. 为profession、age、status创建联合索引。 +4. 为email建立合适的索引来提升查询效率。 +5. 查看tb_user表的所有的索引数据。 + + + + + +## 全文索引 中国 + +全文索引：FULLTEXT索引用于全文搜索，只能在char,varchar,text等中创建全文检索 + +最小搜索长度：3个字符 + +优点：比like快N倍 缺点：会出现精度问题 + + + +​ 创建全文索引 + +```sql +-- 创建表的适合添加全文索引 +create table t_article ( + id int primary key auto_increment , + title varchar(255) , + content varchar(1000) , + writing_date date -- , + -- fulltext (content) -- 创建全文检索 +); + +insert into t_article values(null,"Yesterday Once More","When I was young I listen to the radio",'2021-10-01'); +insert into t_article values(null,"Right Here Waiting","Oceans apart, day after day,and I slowly go insane",'2021-10-02'); +insert into t_article values(null,"My Heart Will Go On","every night in my dreams,i see you, i feel you",'2021-10-03'); +insert into t_article values(null,"Everything I Do","eLook into my eyes,You will see what you mean to me",'2021-10-04'); +insert into t_article values(null,"Called To Say I Love You","say love you no new year's day, to celebrate",'2021-10-05'); +insert into t_article values(null,"Nothing's Gonna Change My Love For You","if i had to live my life without you near me",'2021-10-06'); +insert into t_article values(null,"Everybody","We're gonna bring the flavor show U how.",'2021-10-07'); + +-- 修改表结构添加全文索引 +alter table t_article add fulltext index_content(content) + +-- 添加全文索引 +create fulltext index index_content on t_article(content); + +-- 使用全文索引 +select * from t_article where match(content) against('yo'); -- 没有结果 +select * from t_article where match(content) against('you'); -- 有结果 +select * from t_article where content like '%you%'; +``` + +​ 删除全文索引，与删除普通索引一致。 + +```sql +drop index index_content on t_article; +``` + + + +## explain 执行计划 + +可用于查看某个查询语句的执行详细情况 + +语法： + +```sql +explain select ... from ...... +``` + + + +Explain 执行计划中各个字段的含义: + +| 字段 | 含义 | +| ------------ | ------------------------------------------------------------ | +| id | select查询的序列号，表示查询中执行select子句或者是操作表的顺序(id相同，执行顺序从上到下；id不同，值越大，越先执行)。 | +| select_type | 表示 SELECT 的类型，常见的取值有 SIMPLE（简单表，即不使用表连接或者子查询）、PRIMARY（主查询，即外层的查询）、UNION（UNION 中的第二个或者后面的查询语句）、SUBQUERY（SELECT/WHERE之后包含了子查询）等 | +| type | 表示连接类型，性能由好到差的连接类型为NULL、system、const、eq_ref、ref、range、 index、all | +| possible_key | 显示可能应用在这张表上的索引，一个或多个 | +| key | 实际使用的索引，如果为NULL，则没有使用索引 | +| key_len | 表示索引中使用的字节数， 该值为索引字段最大可能长度，并非实际使用长度，在不损失精确性的前提下，长度越短越好 | +| rows | MySQL认为必须要执行查询的行数，在innodb引擎的表中，是一个估计值，可能并不总是准确的 | +| filtered | 表示返回结果的行数占需读取行数的百分比， filtered 的值越大越好 | + + + +## 索引的使用 + +#### 最左前缀法则（联合索引） + +如果使用了联合索引，要遵守最左前缀法则。 + +最左前缀法则指的是查询从索引的最左列开始，并且不跳过索引中的列。如果跳跃某一列，后面的字段索引失效。 + + + +案例： + +在 tb_user 表中，有一个联合索引，这个联合索引涉及到三个字段，顺序分别为：profession，age，status。 + +```sql +-- 观察key_len +explain select * from tb_user where profession = '软件工程' and age = 31 and status = '0'; +explain select * from tb_user where profession = '软件工程' and age = 31; +explain select * from tb_user where profession = '软件工程'; + +-- 违反法则 +explain select * from tb_user where age = 31 and status = '0'; +explain select * from tb_user where status = '0'; +explain select * from tb_user where profession = '软件工程' and status = '0'; + +-- 思考 +explain select * from tb_user where age = 31 and status = '0' and profession = '软件工程'； +``` + + + +#### 范围查询 + +```sql +explain select * from tb_user where profession = '软件工程' and age > 30 and status = '0'; + +-- 解决 +explain select * from tb_user where profession = '软件工程' and age >= 30 and status = '0'; +``` + + + +## 索引失效情况 + +#### 索引列运算 + +```sql +explain select * from tb_user where substring(phone,10,2) = '15'; +``` + +#### 字符串不加引号 + +```sql +explain select * from tb_user where profession = '软件工程' and age = 31 and status = '0'; +explain select * from tb_user where profession = '软件工程' and age = 31 and status = 0; --失效 + +explain select * from tb_user where phone = '17799990015'; +explain select * from tb_user where phone = 17799990015; --失效 +``` + + + +#### 模糊查询 + +```sql +explain select * from tb_user where profession like '软件%'; +explain select * from tb_user where profession like '%工程'; -- 失效 +explain select * from tb_user where profession like '%工%'; -- 失效 +``` + +#### or连接条件 and + +用or分割开的条件， 如果or前的条件中的列有索引，而后面的列中没有索引，那么涉及的索引都不会被用到。 + +```sql +explain select * from tb_user where id = 10 or age = 23; +explain select * from tb_user where phone = '17799990017' or age = 23; + +--对age字段建立索引,再次执行 +create index idx_user_age on tb_user(age); +``` + +#### 数据分布影响 + +如果MySQL评估使用索引比全表更慢，则不使用索引。 + +```sql +-- 比较运算符范围查询 +select * from tb_user where phone >= '17799990005'; +select * from tb_user where phone >= '17799990015'; + +-- is null 与 is not null +explain select * from tb_user where profession is null; +explain select * from tb_user where profession is not null; +``` + + + +## SQL提示 + +```sql +select * from 表名 use index(索引名) where.... -- 建议 +select * from 表名 ignore index(索引名) where.... -- 忽略 +select * from 表名 force index(索引名) where.... -- 强制 +``` + + + +## 覆盖索引 + +尽量使用覆盖索引，减少select * 的使用。 + +那么什么是覆盖索引呢？ 覆盖索引是指 查询使用了索引，并且需要返回的列，在该索引中已经全部能够找到 。 + +```sql +explain select id, profession from tb_user where profession = '软件工程' and age = 31 and status = '0' ; +explain select id,profession,age,status from tb_user where profession = '软件工程' and age = 31 and status = '0' ; +explain select id,profession,age,status,name from tb_user where profession = '软件工程' and age = 31 and status = '0' ; +explain select * from tb_user where profession = '软件工程' and age = 31 and status = '0'; +``` + +| Extra | 含义 | +| ------------------------ | ------------------------------------------------------------ | +| Using where; Using Index | 查找使用了索引，但是需要的数据都在索引列中能找到，所以不需要回表查询数据 | +| Using index condition | 查找使用了索引，但是需要回表查询数据 | + + + +## 单列索引与联合索引 + +到底是选单列索引还是联合索引？ + +在业务场景中，如果存在多个查询条件，考虑针对于查询字段建立索引时，建议建立联合索引，而非单列索引。 + +-- + +## 索引设计原则 ：索引方便查询的，影响插入。更新，删除 + +1). 数据量较大，且查询比较频繁的表。 100w + +2). 常作为查询条件（where）、排序（order by）、分组（group by）操作的字段。 + +3). 尽量选择区分度高的列，尽量建立唯一索引，区分度越高，使用索引的效率越高。 + +4). 如果是字符串类型的字段，字段的长度较长，可以针对于字段的特点，建立前缀索引。-- 分表 + +5). 尽量使用联合索引，减少单列索引，查询时，联合索引很多时候可以覆盖索引，节省存储空间，避免回表，提高查询效率。 + +6). 要控制索引的数量，索引并不是多多益善，索引越多，维护索引结构的代价也就越大，会影响增删改的效率。 + +7). 如果索引列不能存储NULL值，请在创建表时使用NOT NULL约束它。当优化器知道每列是否包含NULL值时，它可以更好地确定哪个索引最有效地用于查询。 \ No newline at end of file diff --git "a/18 \345\276\220\346\260\270\346\267\263/\346\227\266\351\227\264.png" "b/18 \345\276\220\346\260\270\346\267\263/\346\227\266\351\227\264.png" new file mode 100644 index 0000000000000000000000000000000000000000..fa210de5af684fcdbb190a5c2ce4428525c96e57 GIT binary patch literal 1091 zcmeAS@N?(olHy`uVBq!ia0vp^pMhADg9%9H8+IrHDaPU;cPEB*=VV?2IV|apzK#qG z8~eHcB(eheoCO|{#S9EWB_ParFHOFJfr0skr;B4qMcmsduct~IaM;9Ym5 zcZcBjhj!aq7?M;jD4d-mqnbVW_uo$U7&)Qx;-8ETZVz%M2wO-$VL8WU*|^!!k05vQ zX?+HxqMb|=ChmWi^Xv7+c!r+Hca!VizL~GUy6ar&ftwF>FO;rhKF5~dxUN|C|LV>8 z{nuX?UgrPs_l4ExP_sl;wZ0p+)v9AwUT?>|O^SZg%{q&Y^>JNh+&aj!yx#68l zs$u+^*)2ML*PfR+N4AOI1ls%f@!Z&47yX#}_8aX_Wo6b~>{{_9&v2hda7mQ%VvnCk z(?9!)|8Q&UxqR2~HQ)Qixyg4`QZ{a?J(Uo1$o9Y;0Tc=!QzlN27nAF2D8X znzWs@;+NJg`!Cah!L2#>uHEXXQlCzJ6tg}qlIprG(fa4QDQkW|GLqHeJ|-Eoi{0*_ zL&2WFPlvMKY*JG^?Qrb-mrA8K`4O8|8(cYX^T@)@ciRnRl+XXFifn8QPi5K`pnciT zy|>0&dvV7~d$(gUH`YoUHK_*XX-cd4JBg{^-u`fdb*J8<^w?EE+kej4Tg)$;(;tx( z_Vz*OOo#BTc}cGyyf$gQD&)2;^<09b;RVkxE7-dCSx(*Uj>fAtck|ZvIa#m&VdX1$W`R*xORw}K>uVi~d|p$Om@m$6)p0v^`3wK< zTKSkI2`<1ix1?a3jez}19lMGED|6|D&>zph29&iot-mZXaht=$Neazui}IS}Jh>lz zPhb7i`+8qb%d77;A@*vUlk?E!{fu_~$*}Q%Gv{aTj&IeOIT-{wd z<xRt- wqZho6Iey$)xmdKI;Vst04<~sH2?qr literal 0 HcmV?d00001 -- Gitee From 962ec89f1b64172624d948c495e8917ede6a0870 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E5=BE=90=E6=B0=B8=E6=B7=B3?= <2678158018@qq.com> Date: Thu, 19 Oct 2023 12:42:35 +0800 Subject: [PATCH 2/4] =?UTF-8?q?=E7=AC=AC=E5=8D=81=E5=85=AD=E6=AC=A1?= =?UTF-8?q?=E4=BD=9C=E4=B8=9A=E3=80=81?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../20231018\344\275\234\344\270\232.md" | 137 ++++++++++++++++++ 1 file changed, 137 insertions(+) create mode 100644 "18 \345\276\220\346\260\270\346\267\263/20231018\344\275\234\344\270\232.md" diff --git "a/18 \345\276\220\346\260\270\346\267\263/20231018\344\275\234\344\270\232.md" "b/18 \345\276\220\346\260\270\346\267\263/20231018\344\275\234\344\270\232.md" new file mode 100644 index 0000000..2b96941 --- /dev/null +++ "b/18 \345\276\220\346\260\270\346\267\263/20231018\344\275\234\344\270\232.md" @@ -0,0 +1,137 @@ +```mysql +create table tb_user( + id int primary key auto_increment comment '主键', + name varchar(50) not null comment '用户名', + phone varchar(11) not null comment '手机号', + email varchar(100) comment '邮箱', + profession varchar(11) comment '专业', + age tinyint unsigned comment '年龄', + gender char(1) comment '性别 , 1: 男, 2: 女', + status char(1) comment '状态', + createtime datetime comment '创建时间' +) comment '系统用户表'; + + +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('吕布', '17799990000', 'lvbu666@163.com', '软件工程', 23, '1', '6', '2001-02-02 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('曹操', '17799990001', 'caocao666@qq.com', '通讯工程', 33, '1', '0', '2001-03-05 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('赵云', '17799990002', '17799990@139.com', '英语', 34, '1', '2', '2002-03-02 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('孙悟空', '17799990003', '17799990@sina.com', '工程造价', 54, '1', '0', '2001-07-02 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('花木兰', '17799990004', '19980729@sina.com', '软件工程', 23, '2', '1', '2001-04-22 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('大乔', '17799990005', 'daqiao666@sina.com', '舞蹈', 22, '2', '0', '2001-02-07 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('露娜', '17799990006', 'luna_love@sina.com', '应用数学', 24, '2', '0', '2001-02-08 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('程咬金', '17799990007', 'chengyaojin@163.com', '化工', 38, '1', '5', '2001-05-23 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('项羽', '17799990008', 'xiaoyu666@qq.com', '金属材料', 43, '1', '0', '2001-09-18 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('白起', '17799990009', 'baiqi666@sina.com', '机械工程及其自动化', 27, '1', '2', '2001-08-16 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('韩信', '17799990010', 'hanxin520@163.com', '无机非金属材料工程', 27, '1', '0', '2001-06-12 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('荆轲', '17799990011', 'jingke123@163.com', '会计', 29, '1', '0', '2001-05-11 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('兰陵王', '17799990012', 'lanlinwang666@126.com', '工程造价', 44, '1', '1', '2001-04-09 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('狂铁', '17799990013', 'kuangtie@sina.com', '应用数学', 43, '1', '2', '2001-04-10 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('貂蝉', '17799990014', '84958948374@qq.com', '软件工程', 40, '2', '3', '2001-02-12 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('妲己', '17799990015', '2783238293@qq.com', '软件工程', 31, '2', '0', '2001-01-30 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('芈月', '17799990016', 'xiaomin2001@sina.com', '工业经济', 35, '2', '0', '2000-05-03 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('嬴政', '17799990017', '8839434342@qq.com', '化工', 38, '1', '1', '2001-08-08 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('狄仁杰', '17799990018', 'jujiamlm8166@163.com', '国际贸易', 30, '1', '0', '2007-03-12 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('安琪拉', '17799990019', 'jdodm1h@126.com', '城市规划', 51, '2', '0', '2001-08-15 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('典韦', '17799990020', 'ycaunanjian@163.com', '城市规划', 52, '1', '2', '2000-04-12 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('廉颇', '17799990021', 'lianpo321@126.com', '土木工程', 19, '1', '3', '2002-07-18 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('后羿', '17799990022', 'altycj2000@139.com', '城市园林', 20, '1', '0', '2002-03-10 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('姜子牙', '17799990023', '37483844@qq.com', '工程造价', 29, '1', '4', '2003-05-26 00:00:00'); +``` + +建立一个数据和表（id,name,phone,sex,hobby），想办法插入10万条数据， + +案例 + +执行查询文件tb_user.sql，数据准备好了之后，完成如下需求： + +```mysql +-- 1.name字段为姓名字段，该字段的值可能会重复，为该字段创建索引。 + +create index inx_name on tb_user(`name`); + +show index from tb_user; + +explain select `name` from tb_user; + +-- 2. phone手机号字段的值，是非空，且唯一的，为该字段创建唯一索引。 + +create unique index inx_phone on tb_user(phone); + +show index from tb_user; + +explain select phone from tb_user; + +-- 3. 为profession、age、status创建联合索引。 + +create index inx_user on tb_user(profession,age,`status`); + +show index from tb_user; + +explain select profession,age,`status` from tb_user; + +-- 4. 为email建立合适的索引来提升查询效率。 + +create index inx_email on tb_user(email); + +show index from tb_user; + +explain select email from tb_user; + +-- 5. 查看tb_user表的所有的索引数据。 + +show index from tb_user; +``` + + + + + +```MySQL +create database blue_archive charset utf8; +use blue_archive; +-- -- 建立一个数据和表（id,name,phone,sex,hobby）,想办法插入1000万条数据 +-- drop table student; +create table student( +id int primary key auto_increment, +name varchar(19), +phone varchar(11), +sex varchar(1), +hobby varchar(100) +); +-- +-- drop procedure pro3; +delimiter ^^ +create procedure pro3() +begin +declare fname char(1); +declare name_1 char(1); +declare name_2 char(1); +declare fullname varchar(3); +declare phone char(11); +declare sex varchar(1); +declare hobby varchar(20); +declare i int default 1; + +while i<=10000000 do +set fullname =concat( substring( +'赵钱孙李周吴郑王冯陈褚卫蒋沈韩杨朱秦尤许何吕施张孔曹严华金魏陶姜戚谢邹喻柏水窦章云苏潘葛奚范彭郎鲁韦昌马苗凤花方俞任袁柳酆鲍史唐费廉岑薛雷贺倪汤滕殷罗毕郝邬安常乐于时傅皮卞齐康伍余元卜顾孟平黄和穆萧尹姚邵湛汪祁毛禹狄米贝明臧计伏成戴谈宋茅庞熊纪舒屈项祝董梁杜阮蓝闵席季麻强贾路娄危江童颜郭梅盛林刁钟徐邱骆高夏蔡田樊胡凌霍虞万支柯昝管卢莫经房裘缪干解应宗丁宣贲邓郁单杭洪包诸左石崔吉钮龚程嵇邢滑裴陆荣翁荀羊於惠甄曲家封芮羿储靳汲邴糜松井段富巫乌焦巴弓牧隗山谷车侯宓蓬全郗班仰秋仲伊宫宁仇栾暴甘钭厉戎祖武符刘景詹束龙叶幸司韶郜黎蓟薄印宿白怀蒲邰从鄂索咸籍赖卓蔺屠蒙池乔阴胥能苍双闻莘党翟谭贡劳逄姬申扶堵冉宰郦雍郤璩桑桂濮牛寿通边扈燕冀郏浦尚农温别庄晏柴瞿阎充慕连茹习宦艾鱼容向古易慎戈廖庾终暨居衡步都耿满弘匡国文寇广禄阙东欧殳沃利蔚越夔隆师巩厍聂晁勾敖融冷訾辛阚那简饶空曾毋沙乜养鞠须丰巢关蒯相查後荆红游竺权逯盖益桓公万俟司马上官欧阳夏侯诸葛闻人东方赫连皇甫尉迟公羊澹台公冶宗政濮阳淳于单于太叔申屠商牟佘佴伯赏南宫墨哈谯笪年爱阳佟言福',floor(1+465*rand()),1), + substring( +'恺嵇泽荣州夕晨齐芾璐俏晏黎覃钏皎霏驹旌邕笈中翙至汝术年仁禺翩盂渌莆洵季朔凡洛缤诚冉韦宁里湛珈朦支洌梓凇薏泱祁祯择什阑运亘岐景骞尹恬砺沁谒珈冕璎晳婳惋浅笈漓豫朝律青棂朴楚采粹良天盈俏霆宛漪晢纾夕棹焱亦栎翼舟娣孝樨远晟冶箩暌圣衡翩泯阑桔玖飏棋朴朝坤琬筱闰暖奘蓬昙蓬蔳醇纬旭萄霓缥辽谊炯陇粹芃卫迪真煦忆挚纶愉瑾阑棹葆觉锦娄葭舸桦种忻鸠天栎涧梓岳陇诏迪樗滔瑺些琥凡婕洌支栗珐沥宁濡柏礴裴冉堇霁骏瑗波珲奘伽琝凝',floor(1+201*rand()),1), + substring( +'灏嫣帝信煜彤斓兜姚坚焱柯璘桢章暖冲洁珍城倩毓洺庭祁渔扬卉滨灵星烨祎康瞳晖果盛旺恺河橦光元婉亮溢林滋沛恒熠炎析昱悦潼婷景德戎淼牧潞乐子儿玥微晨曼基玙杨函润知俞沁军姗叶淮坤珞灿欣权唯成和斐申心原伟杰宣斌凯宜圆北园书壹俐涛武一方涵曈凰洛槿旭溶佛喆宥发祖竣晗恩冰妍临澄昕洋品呈仪俊煊汐桓炜沐海晴程煌科恬秋峰家栋媚新曜州楼帅珩瑛晟匀予玺川娜伦然瑀榆玉博玮含珊丹琼怡慧敬珂智市彧朵淳均懿禾政常波婧凌淇憧兰垚洳瑜炅晓傲威歆来潭明业凤伊敏合慕大楠利怿今其桦朝潇墨棠榕瑄森娅屹兴楷湘益男浠南李汝奇有泉玓延如淏万映生名仲普岚云濠佑宝学立杉珏滢希巡吴柳令泓亦圣俪岩国思春曌东瑕惜洲妮存梁戈朗树乔宁珉童宛嵘举同昂哲柔叙瑶端玛千溪樱巍娟玟妧堤帼格卿彦畅梵丰璟泰意月易徽启炆燊琦厅珈富凡曦文甫宏刚乾瑞民睿泊尧楚夕妃沅兮双栩皓严柠冉岳廷儒伯强尹宸安之澜克深瑟熙惠琛玖煦商慈才彪汪枫瀚嘉烁嫄广天松娴昊研剑磊瑾琰仁彬硕湫沫佩忠汶帆琪丽卓梓婵江婕勋焕君熹堂欢志庆悠媛正标禹歌宇可姝峻渲晔义丞仟培源璇泽妤玫潆炘婳先漫琨璐珺振依善仙琳玲桑炉忻净琅梦夏暄奕允白毅序寒吉承岸僮亚礼炫清祺喜潮容祥棋初玄燚浩佳亨桐燕姿华嫒琴',floor(1+488*rand()),1)); + + +set phone=concat('1', + substring(cast(3 + (rand() * 10) % 7 AS char(50)), 1, 1), + right(left(trim(cast(rand() AS char(50))), 11), 9)); + set sex= substring('男女',floor(rand()*2+1),1); + set hobby= + substring('读书编程理财写作设计剪辑修图听歌电影纪录片画画跳舞吉他钢琴架子鼓古筝围棋象棋军棋五子棋手工陶艺茶艺烘培插花收藏美妆美甲养生',floor(1+61*rand()),4); +insert into student values(null,fullname,phone,sex,hobby); +set i=i+1; +end while; +end ^^ +delimiter ; +call pro3(); +``` + -- Gitee From 1733a7f87ed76d22e930345e0667603944f11acd Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E5=BE=90=E6=B0=B8=E6=B7=B3?= <2678158018@qq.com> Date: Thu, 19 Oct 2023 12:43:50 +0800 Subject: [PATCH 3/4] =?UTF-8?q?=E7=AC=AC=E5=8D=81=E4=B9=9D=E6=AC=A1?= =?UTF-8?q?=E7=AC=94=E8=AE=B0?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../20231018\344\275\234\344\270\232.md" | 137 ------------------ 1 file changed, 137 deletions(-) delete mode 100644 "18 \345\276\220\346\260\270\346\267\263/20231018\344\275\234\344\270\232.md" diff --git "a/18 \345\276\220\346\260\270\346\267\263/20231018\344\275\234\344\270\232.md" "b/18 \345\276\220\346\260\270\346\267\263/20231018\344\275\234\344\270\232.md" deleted file mode 100644 index 2b96941..0000000 --- "a/18 \345\276\220\346\260\270\346\267\263/20231018\344\275\234\344\270\232.md" +++ /dev/null @@ -1,137 +0,0 @@ -```mysql -create table tb_user( - id int primary key auto_increment comment '主键', - name varchar(50) not null comment '用户名', - phone varchar(11) not null comment '手机号', - email varchar(100) comment '邮箱', - profession varchar(11) comment '专业', - age tinyint unsigned comment '年龄', - gender char(1) comment '性别 , 1: 男, 2: 女', - status char(1) comment '状态', - createtime datetime comment '创建时间' -) comment '系统用户表'; - - -INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('吕布', '17799990000', 'lvbu666@163.com', '软件工程', 23, '1', '6', '2001-02-02 00:00:00'); -INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('曹操', '17799990001', 'caocao666@qq.com', '通讯工程', 33, '1', '0', '2001-03-05 00:00:00'); -INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('赵云', '17799990002', '17799990@139.com', '英语', 34, '1', '2', '2002-03-02 00:00:00'); -INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('孙悟空', '17799990003', '17799990@sina.com', '工程造价', 54, '1', '0', '2001-07-02 00:00:00'); -INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('花木兰', '17799990004', '19980729@sina.com', '软件工程', 23, '2', '1', '2001-04-22 00:00:00'); -INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('大乔', '17799990005', 'daqiao666@sina.com', '舞蹈', 22, '2', '0', '2001-02-07 00:00:00'); -INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('露娜', '17799990006', 'luna_love@sina.com', '应用数学', 24, '2', '0', '2001-02-08 00:00:00'); -INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('程咬金', '17799990007', 'chengyaojin@163.com', '化工', 38, '1', '5', '2001-05-23 00:00:00'); -INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('项羽', '17799990008', 'xiaoyu666@qq.com', '金属材料', 43, '1', '0', '2001-09-18 00:00:00'); -INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('白起', '17799990009', 'baiqi666@sina.com', '机械工程及其自动化', 27, '1', '2', '2001-08-16 00:00:00'); -INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('韩信', '17799990010', 'hanxin520@163.com', '无机非金属材料工程', 27, '1', '0', '2001-06-12 00:00:00'); -INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('荆轲', '17799990011', 'jingke123@163.com', '会计', 29, '1', '0', '2001-05-11 00:00:00'); -INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('兰陵王', '17799990012', 'lanlinwang666@126.com', '工程造价', 44, '1', '1', '2001-04-09 00:00:00'); -INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('狂铁', '17799990013', 'kuangtie@sina.com', '应用数学', 43, '1', '2', '2001-04-10 00:00:00'); -INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('貂蝉', '17799990014', '84958948374@qq.com', '软件工程', 40, '2', '3', '2001-02-12 00:00:00'); -INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('妲己', '17799990015', '2783238293@qq.com', '软件工程', 31, '2', '0', '2001-01-30 00:00:00'); -INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('芈月', '17799990016', 'xiaomin2001@sina.com', '工业经济', 35, '2', '0', '2000-05-03 00:00:00'); -INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('嬴政', '17799990017', '8839434342@qq.com', '化工', 38, '1', '1', '2001-08-08 00:00:00'); -INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('狄仁杰', '17799990018', 'jujiamlm8166@163.com', '国际贸易', 30, '1', '0', '2007-03-12 00:00:00'); -INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('安琪拉', '17799990019', 'jdodm1h@126.com', '城市规划', 51, '2', '0', '2001-08-15 00:00:00'); -INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('典韦', '17799990020', 'ycaunanjian@163.com', '城市规划', 52, '1', '2', '2000-04-12 00:00:00'); -INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('廉颇', '17799990021', 'lianpo321@126.com', '土木工程', 19, '1', '3', '2002-07-18 00:00:00'); -INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('后羿', '17799990022', 'altycj2000@139.com', '城市园林', 20, '1', '0', '2002-03-10 00:00:00'); -INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('姜子牙', '17799990023', '37483844@qq.com', '工程造价', 29, '1', '4', '2003-05-26 00:00:00'); -``` - -建立一个数据和表（id,name,phone,sex,hobby），想办法插入10万条数据， - -案例 - -执行查询文件tb_user.sql，数据准备好了之后，完成如下需求： - -```mysql --- 1.name字段为姓名字段，该字段的值可能会重复，为该字段创建索引。 - -create index inx_name on tb_user(`name`); - -show index from tb_user; - -explain select `name` from tb_user; - --- 2. phone手机号字段的值，是非空，且唯一的，为该字段创建唯一索引。 - -create unique index inx_phone on tb_user(phone); - -show index from tb_user; - -explain select phone from tb_user; - --- 3. 为profession、age、status创建联合索引。 - -create index inx_user on tb_user(profession,age,`status`); - -show index from tb_user; - -explain select profession,age,`status` from tb_user; - --- 4. 为email建立合适的索引来提升查询效率。 - -create index inx_email on tb_user(email); - -show index from tb_user; - -explain select email from tb_user; - --- 5. 查看tb_user表的所有的索引数据。 - -show index from tb_user; -``` - - - - - -```MySQL -create database blue_archive charset utf8; -use blue_archive; --- -- 建立一个数据和表（id,name,phone,sex,hobby）,想办法插入1000万条数据 --- drop table student; -create table student( -id int primary key auto_increment, -name varchar(19), -phone varchar(11), -sex varchar(1), -hobby varchar(100) -); --- --- drop procedure pro3; -delimiter ^^ -create procedure pro3() -begin -declare fname char(1); -declare name_1 char(1); -declare name_2 char(1); -declare fullname varchar(3); -declare phone char(11); -declare sex varchar(1); -declare hobby varchar(20); -declare i int default 1; - -while i<=10000000 do -set fullname =concat( substring( -'赵钱孙李周吴郑王冯陈褚卫蒋沈韩杨朱秦尤许何吕施张孔曹严华金魏陶姜戚谢邹喻柏水窦章云苏潘葛奚范彭郎鲁韦昌马苗凤花方俞任袁柳酆鲍史唐费廉岑薛雷贺倪汤滕殷罗毕郝邬安常乐于时傅皮卞齐康伍余元卜顾孟平黄和穆萧尹姚邵湛汪祁毛禹狄米贝明臧计伏成戴谈宋茅庞熊纪舒屈项祝董梁杜阮蓝闵席季麻强贾路娄危江童颜郭梅盛林刁钟徐邱骆高夏蔡田樊胡凌霍虞万支柯昝管卢莫经房裘缪干解应宗丁宣贲邓郁单杭洪包诸左石崔吉钮龚程嵇邢滑裴陆荣翁荀羊於惠甄曲家封芮羿储靳汲邴糜松井段富巫乌焦巴弓牧隗山谷车侯宓蓬全郗班仰秋仲伊宫宁仇栾暴甘钭厉戎祖武符刘景詹束龙叶幸司韶郜黎蓟薄印宿白怀蒲邰从鄂索咸籍赖卓蔺屠蒙池乔阴胥能苍双闻莘党翟谭贡劳逄姬申扶堵冉宰郦雍郤璩桑桂濮牛寿通边扈燕冀郏浦尚农温别庄晏柴瞿阎充慕连茹习宦艾鱼容向古易慎戈廖庾终暨居衡步都耿满弘匡国文寇广禄阙东欧殳沃利蔚越夔隆师巩厍聂晁勾敖融冷訾辛阚那简饶空曾毋沙乜养鞠须丰巢关蒯相查後荆红游竺权逯盖益桓公万俟司马上官欧阳夏侯诸葛闻人东方赫连皇甫尉迟公羊澹台公冶宗政濮阳淳于单于太叔申屠商牟佘佴伯赏南宫墨哈谯笪年爱阳佟言福',floor(1+465*rand()),1), - substring( -'恺嵇泽荣州夕晨齐芾璐俏晏黎覃钏皎霏驹旌邕笈中翙至汝术年仁禺翩盂渌莆洵季朔凡洛缤诚冉韦宁里湛珈朦支洌梓凇薏泱祁祯择什阑运亘岐景骞尹恬砺沁谒珈冕璎晳婳惋浅笈漓豫朝律青棂朴楚采粹良天盈俏霆宛漪晢纾夕棹焱亦栎翼舟娣孝樨远晟冶箩暌圣衡翩泯阑桔玖飏棋朴朝坤琬筱闰暖奘蓬昙蓬蔳醇纬旭萄霓缥辽谊炯陇粹芃卫迪真煦忆挚纶愉瑾阑棹葆觉锦娄葭舸桦种忻鸠天栎涧梓岳陇诏迪樗滔瑺些琥凡婕洌支栗珐沥宁濡柏礴裴冉堇霁骏瑗波珲奘伽琝凝',floor(1+201*rand()),1), - substring( -'灏嫣帝信煜彤斓兜姚坚焱柯璘桢章暖冲洁珍城倩毓洺庭祁渔扬卉滨灵星烨祎康瞳晖果盛旺恺河橦光元婉亮溢林滋沛恒熠炎析昱悦潼婷景德戎淼牧潞乐子儿玥微晨曼基玙杨函润知俞沁军姗叶淮坤珞灿欣权唯成和斐申心原伟杰宣斌凯宜圆北园书壹俐涛武一方涵曈凰洛槿旭溶佛喆宥发祖竣晗恩冰妍临澄昕洋品呈仪俊煊汐桓炜沐海晴程煌科恬秋峰家栋媚新曜州楼帅珩瑛晟匀予玺川娜伦然瑀榆玉博玮含珊丹琼怡慧敬珂智市彧朵淳均懿禾政常波婧凌淇憧兰垚洳瑜炅晓傲威歆来潭明业凤伊敏合慕大楠利怿今其桦朝潇墨棠榕瑄森娅屹兴楷湘益男浠南李汝奇有泉玓延如淏万映生名仲普岚云濠佑宝学立杉珏滢希巡吴柳令泓亦圣俪岩国思春曌东瑕惜洲妮存梁戈朗树乔宁珉童宛嵘举同昂哲柔叙瑶端玛千溪樱巍娟玟妧堤帼格卿彦畅梵丰璟泰意月易徽启炆燊琦厅珈富凡曦文甫宏刚乾瑞民睿泊尧楚夕妃沅兮双栩皓严柠冉岳廷儒伯强尹宸安之澜克深瑟熙惠琛玖煦商慈才彪汪枫瀚嘉烁嫄广天松娴昊研剑磊瑾琰仁彬硕湫沫佩忠汶帆琪丽卓梓婵江婕勋焕君熹堂欢志庆悠媛正标禹歌宇可姝峻渲晔义丞仟培源璇泽妤玫潆炘婳先漫琨璐珺振依善仙琳玲桑炉忻净琅梦夏暄奕允白毅序寒吉承岸僮亚礼炫清祺喜潮容祥棋初玄燚浩佳亨桐燕姿华嫒琴',floor(1+488*rand()),1)); - - -set phone=concat('1', - substring(cast(3 + (rand() * 10) % 7 AS char(50)), 1, 1), - right(left(trim(cast(rand() AS char(50))), 11), 9)); - set sex= substring('男女',floor(rand()*2+1),1); - set hobby= - substring('读书编程理财写作设计剪辑修图听歌电影纪录片画画跳舞吉他钢琴架子鼓古筝围棋象棋军棋五子棋手工陶艺茶艺烘培插花收藏美妆美甲养生',floor(1+61*rand()),4); -insert into student values(null,fullname,phone,sex,hobby); -set i=i+1; -end while; -end ^^ -delimiter ; -call pro3(); -``` - -- Gitee From 002686d6e52befd4197f0a541274b301b87c2206 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E5=BE=90=E6=B0=B8=E6=B7=B3?= <2678158018@qq.com> Date: Thu, 19 Oct 2023 12:44:44 +0800 Subject: [PATCH 4/4] =?UTF-8?q?=E7=AC=AC=E5=8D=81=E5=85=AD=E6=AC=A1?= =?UTF-8?q?=E4=BD=9C=E4=B8=9A?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../20231018\344\275\234\344\270\232.md" | 137 ++++++++++++++++++ 1 file changed, 137 insertions(+) create mode 100644 "18 \345\276\220\346\260\270\346\267\263/20231018\344\275\234\344\270\232.md" diff --git "a/18 \345\276\220\346\260\270\346\267\263/20231018\344\275\234\344\270\232.md" "b/18 \345\276\220\346\260\270\346\267\263/20231018\344\275\234\344\270\232.md" new file mode 100644 index 0000000..2b96941 --- /dev/null +++ "b/18 \345\276\220\346\260\270\346\267\263/20231018\344\275\234\344\270\232.md" @@ -0,0 +1,137 @@ +```mysql +create table tb_user( + id int primary key auto_increment comment '主键', + name varchar(50) not null comment '用户名', + phone varchar(11) not null comment '手机号', + email varchar(100) comment '邮箱', + profession varchar(11) comment '专业', + age tinyint unsigned comment '年龄', + gender char(1) comment '性别 , 1: 男, 2: 女', + status char(1) comment '状态', + createtime datetime comment '创建时间' +) comment '系统用户表'; + + +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('吕布', '17799990000', 'lvbu666@163.com', '软件工程', 23, '1', '6', '2001-02-02 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('曹操', '17799990001', 'caocao666@qq.com', '通讯工程', 33, '1', '0', '2001-03-05 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('赵云', '17799990002', '17799990@139.com', '英语', 34, '1', '2', '2002-03-02 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('孙悟空', '17799990003', '17799990@sina.com', '工程造价', 54, '1', '0', '2001-07-02 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('花木兰', '17799990004', '19980729@sina.com', '软件工程', 23, '2', '1', '2001-04-22 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('大乔', '17799990005', 'daqiao666@sina.com', '舞蹈', 22, '2', '0', '2001-02-07 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('露娜', '17799990006', 'luna_love@sina.com', '应用数学', 24, '2', '0', '2001-02-08 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('程咬金', '17799990007', 'chengyaojin@163.com', '化工', 38, '1', '5', '2001-05-23 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('项羽', '17799990008', 'xiaoyu666@qq.com', '金属材料', 43, '1', '0', '2001-09-18 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('白起', '17799990009', 'baiqi666@sina.com', '机械工程及其自动化', 27, '1', '2', '2001-08-16 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('韩信', '17799990010', 'hanxin520@163.com', '无机非金属材料工程', 27, '1', '0', '2001-06-12 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('荆轲', '17799990011', 'jingke123@163.com', '会计', 29, '1', '0', '2001-05-11 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('兰陵王', '17799990012', 'lanlinwang666@126.com', '工程造价', 44, '1', '1', '2001-04-09 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('狂铁', '17799990013', 'kuangtie@sina.com', '应用数学', 43, '1', '2', '2001-04-10 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('貂蝉', '17799990014', '84958948374@qq.com', '软件工程', 40, '2', '3', '2001-02-12 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('妲己', '17799990015', '2783238293@qq.com', '软件工程', 31, '2', '0', '2001-01-30 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('芈月', '17799990016', 'xiaomin2001@sina.com', '工业经济', 35, '2', '0', '2000-05-03 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('嬴政', '17799990017', '8839434342@qq.com', '化工', 38, '1', '1', '2001-08-08 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('狄仁杰', '17799990018', 'jujiamlm8166@163.com', '国际贸易', 30, '1', '0', '2007-03-12 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('安琪拉', '17799990019', 'jdodm1h@126.com', '城市规划', 51, '2', '0', '2001-08-15 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('典韦', '17799990020', 'ycaunanjian@163.com', '城市规划', 52, '1', '2', '2000-04-12 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('廉颇', '17799990021', 'lianpo321@126.com', '土木工程', 19, '1', '3', '2002-07-18 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('后羿', '17799990022', 'altycj2000@139.com', '城市园林', 20, '1', '0', '2002-03-10 00:00:00'); +INSERT INTO tb_user (name, phone, email, profession, age, gender, status, createtime) VALUES ('姜子牙', '17799990023', '37483844@qq.com', '工程造价', 29, '1', '4', '2003-05-26 00:00:00'); +``` + +建立一个数据和表（id,name,phone,sex,hobby），想办法插入10万条数据， + +案例 + +执行查询文件tb_user.sql，数据准备好了之后，完成如下需求： + +```mysql +-- 1.name字段为姓名字段，该字段的值可能会重复，为该字段创建索引。 + +create index inx_name on tb_user(`name`); + +show index from tb_user; + +explain select `name` from tb_user; + +-- 2. phone手机号字段的值，是非空，且唯一的，为该字段创建唯一索引。 + +create unique index inx_phone on tb_user(phone); + +show index from tb_user; + +explain select phone from tb_user; + +-- 3. 为profession、age、status创建联合索引。 + +create index inx_user on tb_user(profession,age,`status`); + +show index from tb_user; + +explain select profession,age,`status` from tb_user; + +-- 4. 为email建立合适的索引来提升查询效率。 + +create index inx_email on tb_user(email); + +show index from tb_user; + +explain select email from tb_user; + +-- 5. 查看tb_user表的所有的索引数据。 + +show index from tb_user; +``` + + + + + +```MySQL +create database blue_archive charset utf8; +use blue_archive; +-- -- 建立一个数据和表（id,name,phone,sex,hobby）,想办法插入1000万条数据 +-- drop table student; +create table student( +id int primary key auto_increment, +name varchar(19), +phone varchar(11), +sex varchar(1), +hobby varchar(100) +); +-- +-- drop procedure pro3; +delimiter ^^ +create procedure pro3() +begin +declare fname char(1); +declare name_1 char(1); +declare name_2 char(1); +declare fullname varchar(3); +declare phone char(11); +declare sex varchar(1); +declare hobby varchar(20); +declare i int default 1; + +while i<=10000000 do +set fullname =concat( substring( +'赵钱孙李周吴郑王冯陈褚卫蒋沈韩杨朱秦尤许何吕施张孔曹严华金魏陶姜戚谢邹喻柏水窦章云苏潘葛奚范彭郎鲁韦昌马苗凤花方俞任袁柳酆鲍史唐费廉岑薛雷贺倪汤滕殷罗毕郝邬安常乐于时傅皮卞齐康伍余元卜顾孟平黄和穆萧尹姚邵湛汪祁毛禹狄米贝明臧计伏成戴谈宋茅庞熊纪舒屈项祝董梁杜阮蓝闵席季麻强贾路娄危江童颜郭梅盛林刁钟徐邱骆高夏蔡田樊胡凌霍虞万支柯昝管卢莫经房裘缪干解应宗丁宣贲邓郁单杭洪包诸左石崔吉钮龚程嵇邢滑裴陆荣翁荀羊於惠甄曲家封芮羿储靳汲邴糜松井段富巫乌焦巴弓牧隗山谷车侯宓蓬全郗班仰秋仲伊宫宁仇栾暴甘钭厉戎祖武符刘景詹束龙叶幸司韶郜黎蓟薄印宿白怀蒲邰从鄂索咸籍赖卓蔺屠蒙池乔阴胥能苍双闻莘党翟谭贡劳逄姬申扶堵冉宰郦雍郤璩桑桂濮牛寿通边扈燕冀郏浦尚农温别庄晏柴瞿阎充慕连茹习宦艾鱼容向古易慎戈廖庾终暨居衡步都耿满弘匡国文寇广禄阙东欧殳沃利蔚越夔隆师巩厍聂晁勾敖融冷訾辛阚那简饶空曾毋沙乜养鞠须丰巢关蒯相查後荆红游竺权逯盖益桓公万俟司马上官欧阳夏侯诸葛闻人东方赫连皇甫尉迟公羊澹台公冶宗政濮阳淳于单于太叔申屠商牟佘佴伯赏南宫墨哈谯笪年爱阳佟言福',floor(1+465*rand()),1), + substring( +'恺嵇泽荣州夕晨齐芾璐俏晏黎覃钏皎霏驹旌邕笈中翙至汝术年仁禺翩盂渌莆洵季朔凡洛缤诚冉韦宁里湛珈朦支洌梓凇薏泱祁祯择什阑运亘岐景骞尹恬砺沁谒珈冕璎晳婳惋浅笈漓豫朝律青棂朴楚采粹良天盈俏霆宛漪晢纾夕棹焱亦栎翼舟娣孝樨远晟冶箩暌圣衡翩泯阑桔玖飏棋朴朝坤琬筱闰暖奘蓬昙蓬蔳醇纬旭萄霓缥辽谊炯陇粹芃卫迪真煦忆挚纶愉瑾阑棹葆觉锦娄葭舸桦种忻鸠天栎涧梓岳陇诏迪樗滔瑺些琥凡婕洌支栗珐沥宁濡柏礴裴冉堇霁骏瑗波珲奘伽琝凝',floor(1+201*rand()),1), + substring( +'灏嫣帝信煜彤斓兜姚坚焱柯璘桢章暖冲洁珍城倩毓洺庭祁渔扬卉滨灵星烨祎康瞳晖果盛旺恺河橦光元婉亮溢林滋沛恒熠炎析昱悦潼婷景德戎淼牧潞乐子儿玥微晨曼基玙杨函润知俞沁军姗叶淮坤珞灿欣权唯成和斐申心原伟杰宣斌凯宜圆北园书壹俐涛武一方涵曈凰洛槿旭溶佛喆宥发祖竣晗恩冰妍临澄昕洋品呈仪俊煊汐桓炜沐海晴程煌科恬秋峰家栋媚新曜州楼帅珩瑛晟匀予玺川娜伦然瑀榆玉博玮含珊丹琼怡慧敬珂智市彧朵淳均懿禾政常波婧凌淇憧兰垚洳瑜炅晓傲威歆来潭明业凤伊敏合慕大楠利怿今其桦朝潇墨棠榕瑄森娅屹兴楷湘益男浠南李汝奇有泉玓延如淏万映生名仲普岚云濠佑宝学立杉珏滢希巡吴柳令泓亦圣俪岩国思春曌东瑕惜洲妮存梁戈朗树乔宁珉童宛嵘举同昂哲柔叙瑶端玛千溪樱巍娟玟妧堤帼格卿彦畅梵丰璟泰意月易徽启炆燊琦厅珈富凡曦文甫宏刚乾瑞民睿泊尧楚夕妃沅兮双栩皓严柠冉岳廷儒伯强尹宸安之澜克深瑟熙惠琛玖煦商慈才彪汪枫瀚嘉烁嫄广天松娴昊研剑磊瑾琰仁彬硕湫沫佩忠汶帆琪丽卓梓婵江婕勋焕君熹堂欢志庆悠媛正标禹歌宇可姝峻渲晔义丞仟培源璇泽妤玫潆炘婳先漫琨璐珺振依善仙琳玲桑炉忻净琅梦夏暄奕允白毅序寒吉承岸僮亚礼炫清祺喜潮容祥棋初玄燚浩佳亨桐燕姿华嫒琴',floor(1+488*rand()),1)); + + +set phone=concat('1', + substring(cast(3 + (rand() * 10) % 7 AS char(50)), 1, 1), + right(left(trim(cast(rand() AS char(50))), 11), 9)); + set sex= substring('男女',floor(rand()*2+1),1); + set hobby= + substring('读书编程理财写作设计剪辑修图听歌电影纪录片画画跳舞吉他钢琴架子鼓古筝围棋象棋军棋五子棋手工陶艺茶艺烘培插花收藏美妆美甲养生',floor(1+61*rand()),4); +insert into student values(null,fullname,phone,sex,hobby); +set i=i+1; +end while; +end ^^ +delimiter ; +call pro3(); +``` + -- Gitee