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
