Sql语句-case when then else end

本文主要是介绍Sql语句-case when then else end，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

根据上面的表信息输出下面的结果：

下面是建库和表结构据：

create table DeptSales
(deptID int,SubjMonth int ,sales int ,deptname varchar(50)
)

insert into deptsales (deptid ,subjmonth,sales) values (1,1,55);
insert into deptsales (deptid ,subjmonth,sales) values (2,1,66);
insert into deptsales (deptid ,subjmonth,sales) values (3,1,77);
insert into deptsales (deptid ,subjmonth,sales) values (2,2,34);
insert into deptsales (deptid ,subjmonth,sales) values (4,2,56);
insert into deptsales (deptid ,subjmonth,sales) values (3,3,78);

执行sql语句：

mysql> select deptID as '部门',sum(case SubjMonth when 1 then sales end) '一月销售额',sum(case SubjMonth when 2 then sales end) '二月销售额',sum(case SubjMonth when 3 then sales end) '三月销售额',sum(case SubjMonth when 4 then sales end) '四月销售额'  from deptsales d group by deptID;
+------+------------+------------+------------+------------+
| 部门 | 一月销售额 | 二月销售额 | 三月销售额 | 四月销售额 |
+------+------------+------------+------------+------------+
|    1 | 55         | NULL       | NULL       | NULL       |
|    2 | 66         | 34         | NULL       | NULL       |
|    3 | 77         | NULL       | 78         | NULL       |
|    4 | NULL       | 56         | NULL       | NULL       |
+------+------------+------------+------------+------------+
4 rows in set

这篇关于Sql语句-case when then else end的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！

---