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+## 笔记
+
+delimiter //
+create function f1(myid int)     # 函数传参默认是 in 类型，需要省略
+    returns varchar(20)            # 返回值类型，只能传出一个
+    deterministic               # 指名函数内有无 SQL语句
+    contains sql              # no sql 就是说明没有 SQL语句
+begin
+    return (select name from student where id = myid);
+end //
+
+delimiter ;
+
+fetch 游标名 into 变量1，变量...;
+
+注意：
+
+变量的个数是根据定义游标时查询的字段个数决定
+
+每 fetch 一次取一行，依次向下取
+
+close 游标名;   关闭游标
+
+
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+
+
+作业
+
+-- -- 部门表
+-- create table dept(
+--     deptno int primary key auto_increment, -- 部门编号
+--     dname varchar(14) ,      -- 部门名字
+--     loc varchar(13)   -- 地址
+-- ) ;
+-- -- 员工表
+-- create table emp(
+--     empno int primary key auto_increment,-- 员工编号
+--     ename varchar(10), -- 员工姓名                                        -
+--     job varchar(9),    -- 岗位
+--     mgr int,     -- 直接领导编号
+--     hiredate date, -- 雇佣日期，入职日期
+--     sal int, -- 薪水
+--     comm int,  -- 提成
+--     deptno int not null, -- 部门编号
+--     foreign key (deptno) references dept(deptno)
+-- );
+-- insert into dept values(10,'财务部','北京');
+-- insert into dept values(20,'研发部','上海');
+-- insert into dept values(30,'销售部','广州');
+-- insert into dept values(40,'行政部','深圳');
+-- insert into emp values(7369,'刘一','职员',7902,'1980-12-17',800,null,20);
+-- insert into emp values(7499,'陈二','推销员',7698,'1981-02-20',1600,300,30);
+-- insert into emp values(7521,'张三','推销员',7698,'1981-02-22',1250,500,30);
+-- insert into emp values(7566,'李四','经理',7839,'1981-04-02',2975,null,20);
+-- insert into emp values(7654,'王五','推销员',7698,'1981-09-28',1250,1400,30);
+-- insert into emp values(7698,'赵六','经理',7839,'1981-05-01',2850,null,30);
+-- insert into emp values(7782,'孙七','经理',7839,'1981-06-09',2450,null,10);
+-- insert into emp values(7788,'周八','分析师',7566,'1987-06-13',3000,null,20);
+-- insert into emp values(7839,'吴九','总裁',null,'1981-11-17',5000,null,10);
+-- insert into emp values(7844,'郑十','推销员',7698,'1981-09-08',1500,0,30);
+-- insert into emp values(7876,'郭十一','职员',7788,'1987-06-13',1100,null,20);
+-- insert into emp values(7900,'钱多多','职员',7698,'1981-12-03',950,null,30);
+-- insert into emp values(7902,'大锦鲤','分析师',7566,'1981-12-03',3000,null,20);
+-- insert into emp values(7934,'木有钱','职员',7782,'1983-01-23',1300,null,10);
+
+1.利用游标，查询并计算出emp表中全公司的总薪资(salary和comm)
+
+delimiter //
+create PROCEDURE salary_sum(out sum _salary double)
+ begin
+      declare emp_count int; 
+    declare salary double;
+    declare com double;
+    declare sum double default 0;
+    declare i int default 1;
+    declare my_salary cursor for select sal,ifnull(comm,0) from emp;
+    # declare continue handler for 1329 set i = 0;
+    select count(*) into emp_count from emp;
+    open my_salary;
+    while i<= emp_count do
+        fetch my_salary into salary,com;
+        set sum = sum + salary + com ;
+        set i = i+1;
+    end while;
+    set sum_salary = sum;
+    close my_salary;
+
+end //
+delimiter ;
+
+call salary_sum(@sum);
+select @sum;
+
+# select sum(sal+ifnull(comm,0)) from emp;
+
+2.利用游标修改表格，如果sal<1000,则删除工资为此值的员工，如果1000 < sal <= 3000,该员工薪资涨100，否则扣工资100