From 97bf748ada1cf5f9c4d546c2fe034dd27e925a1b Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E5=94=90=E5=9B=BD=E4=BA=AE?= <647597435@qq.com> Date: Fri, 24 Feb 2023 19:52:13 +0800 Subject: [PATCH] =?UTF-8?q?20230224=E5=9F=BA=E7=A1=80=E6=9F=A5=E8=AF=A2=5F?= =?UTF-8?q?=E8=BF=90=E7=AE=97=E7=AC=A6?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- ...2_\350\277\220\347\256\227\347\254\246.md" | 218 ++++++++++++++++++ 1 file changed, 218 insertions(+) create mode 100644 "19\345\224\220\345\233\275\344\272\256/20230224\345\237\272\347\241\200\346\237\245\350\257\242_\350\277\220\347\256\227\347\254\246.md" diff --git "a/19\345\224\220\345\233\275\344\272\256/20230224\345\237\272\347\241\200\346\237\245\350\257\242_\350\277\220\347\256\227\347\254\246.md" "b/19\345\224\220\345\233\275\344\272\256/20230224\345\237\272\347\241\200\346\237\245\350\257\242_\350\277\220\347\256\227\347\254\246.md" new file mode 100644 index 0000000..d1b2eac --- /dev/null +++ "b/19\345\224\220\345\233\275\344\272\256/20230224\345\237\272\347\241\200\346\237\245\350\257\242_\350\277\220\347\256\227\347\254\246.md" @@ -0,0 +1,218 @@ +## 第1题：员工表 + +```mysql +drop table if exists `employee`; +#创建employee表 +CREATE TABLE employee( + id INT, + `name` VARCHAR(20), + sex VARCHAR(20), + tel VARCHAR(20), + addr VARCHAR(50), + salary FLOAT +); + +#添加信息 +INSERT INTO employee(id,`name`,sex,tel,addr,salary)VALUES +(10001,'张一一','男','13456789000','广东韶关',10010.58), +(10002,'刘小红','女','13454319000','广东江门',12010.21), +(10003,'李四','男','0751-1234567','广东佛山',10040.11), +(10004,'刘小强','男','0755-5555555','广东深圳',15010.23), +(10005,'王艳','男',NULL,'广东广州',14050.16); +``` + + + +| **id** | **name** | **sex** | **tel** | **addr** | **salary** | +| ------ | -------- | ------- | ------------ | -------- | ---------- | +| 10001 | 张一一 | 男 | 13456789000 | 广东韶关 | 10010.58 | +| 10002 | 刘小红 | 女 | 13454319000 | 广东江门 | 12010.21 | +| 10003 | 李四 | 男 | 0751-1234567 | 广东佛山 | 10040.11 | +| 10004 | 刘小强 | 男 | 0755-5555555 | 广东深圳 | 15010.23 | +| 10005 | 王艳 | 女 | NULL | 广东广州 | 14050.16 | + +```mysql +CREATE DATABASE pdd CHARSET utf8; +use pdd ; +CREATE TABLE employee( + id INT, + `name` VARCHAR(20), + sex VARCHAR(20), + tel VARCHAR(20), + addr VARCHAR(50), + salary FLOAT +); +INSERT INTO employee(id,`name`,sex,tel,addr,salary)VALUES +(10001,'张一一','男','13456789000','广东韶关',10010.58), +(10002,'刘小红','女','13454319000','广东江门',12010.21), +(10003,'李四','男','0751-1234567','广东佛山',10040.11), +(10004,'刘小强','男','0755-5555555','广东深圳',15010.23), +(10005,'王艳','男',NULL,'广东广州',14050.16); +SELECT*FROM employee ; +``` + +**要求1：**查询出薪资在12000~13000之间的员工信息。 + +```mysql +SELECT id,name,sex,tel,addr,salary FROM employee WHERE salary>12000 && salary<13000; +``` + +**要求2：**查询出姓“刘”的员工的工号，姓名，家庭住址。 + +```mysql +SELECT id,`name`,addr from employee where `name` like '刘%%'; +``` + +**要求3：**将“李四”的家庭住址改为“广东韶关” + +```mysql +UPDATE employee set addr ='广东韶关' where `name`='李四'; +SELECT * from employee ; +``` + +**要求4：**查询出名字中带“小”的员工 + +```mysql +SELECT *from employee where `name` like '%小%'; + + +``` + +**要求5：**查询出薪资高于11000的男员工信息 + +```mysql +SELECT *from employee where salary >10000 AND sex ='男'; +``` + +**要求6：**查询没有登记电话号码的员工 + +```mysql +SELECT *from employee where tel is null; + + +``` + +**要求7：**查询薪资高于12000或者家是广东深圳、广州的男员工 + +```mysql +SELECT *from employee where salary >12000 || (addr ='广东深圳' AND addr ='广州' and sex ='男' ); +``` + +**要求8：**查询每个员工的年薪，显示“姓名、年薪” + +```mysql +SELECT `name` as '姓名' , salary as '年薪' from employee; +``` + +## 第2题：国家信息表 + +countries_info表中存储了国家名称、所属大陆、面积、人口和 GDP 值。 + +```mysql +DROP TABLE IF EXISTS `countries_info`; +CREATE TABLE `countries_info`( + `name` VARCHAR(100), + `continent` VARCHAR(100), + `area` INT, + population INT, + gdp BIGINT +); + +INSERT INTO countries_info VALUES +('Afghanistan','Asia',652230,25500100,20343000000), +('Albania','Europe',28748,2831741,12960000000), +('Algeria','Africa',2381741,37100000,188681000000), +('Andorra','Europe',468,78115,3712000000), +('Angola','Africa',1246700,20609294,100990000000); +``` + +表数据样例： + +```mysql ++-------------+-----------+---------+------------+--------------+ +| name | continent | area | population | gdp | ++-------------+-----------+---------+------------+--------------+ +| Afghanistan | Asia | 652230 | 25500100 | 20343000000 | +| Albania | Europe | 28748 | 2831741 | 12960000000 | +| Algeria | Africa | 2381741 | 37100000 | 188681000000 | +| Andorra | Europe | 468 | 78115 | 3712000000 | +| Angola | Africa | 1246700 | 20609294 | 100990000000 | ++-------------+-----------+---------+------------+--------------+ +``` + +```mysql +CREATE database countries_info charset utf8; +use countries_info; +CREATE TABLE `countries_info`( +`name` VARCHAR(100), +`continent` VARCHAR(100), +`area` INT, +population INT, +gdp BIGINT +); + +INSERT INTO countries_info VALUES +('Afghanistan','Asia',652230,25500100,20343000000), +('Albania','Europe',28748,2831741,12960000000), +('Algeria','Africa',2381741,37100000,188681000000), +('Andorra','Europe',468,78115,3712000000), +('Angola','Africa',1246700,20609294,100990000000); +select * from countries_info ; +``` + + + +**要求1：** 查询大国 的国家名称、人口和面积。 + +如果一个国家满足下述两个条件之一，则认为该国是 大国 ： + +- 面积至少为 300万平方公里（即，3000000 km2） + +- 人口至少为 2500 万（即 25000000） + + ```mysql + SELECT `name`,population, `area` from `countries_info` where `area`>3000000 || population >25000000; + ``` + +**要求2：**查询属于亚洲的国家名称、所属大陆、面积、人口和 GDP 值 + +```mysql +SELECT `name`,`continent`,`area`,population,gdp from countries_info where `continent`='Asia'; +``` + +**要求3：**查询国土面积不足1万平方公里且人口不走10万人的国家信息 + +```mysql +SELECT *from countries_info WHERE `area`<10000 and population<100000; +``` + +**要求4：**查询国家名字中包含“o“字母的国家信息 + +```mysql +SELECT *from countries_info WHERE `name` like '%%%o%%%'; +``` + +**要求5：**查询GDP值超过10000000000的国家信息 + +```mysql +SELECT *from countries_info WHERE gdp>10000000000; +``` + +**要求6：**查询每个国家的人均贡献GDP值（GDP/人口总数）并显示为“国家名、人口、GDP值、人均贡献GDP值” + +```mysql +SELECT `name` as '国家名',population as '人口',gdp as 'GDP值', gdp/population as '人均贡献GDP值' from countries_info ; +``` + +**要求7：**查询人均贡献GDP值低于1000的国家信息。 + +```mysql +SELECT * from countries_info WHERE gdp/population<1000; +``` + +**要求8：**查询每个国家的人均国土面积（面积/人口总数）并显示为“国家名、面积、人口、人均国土面积值” + +```mysql +SELECT `name` as '国家名',`area` as '面积',population as '人口',`area`/population as '人均国土面积值' from countries_info ; +``` + -- Gitee