Question

我有一张表

ID  |   NAME    |   DEPT
1   |   A       |   D-1
2   |   B       |   D-1
3   |   C       |   D-2
4   |   D       |   D-3
5   |   E       |   D-1
6   |   F       |   D-3
7   |   G       |   D-4

现在我想获取像

这样的结果

DEPT    |   COUNT(DEPT)
D-1     |   3
OTHERS  |   4

任何人都可以帮我写这个查询吗？

Answer 1

您需要使用CASE按D-1和Others对数据进行分组：

select 
  case when dept = 'D-1' then 'D-1' else 'Others' end as Dept,
  count(*) as Total
from yt
group by case when dept = 'D-1' then 'D-1' else 'Others' end;

请参阅SQL Fiddle with Demo

Answer 2

我猜你想要最大的发生部门与计数和其他部门与休息部门的总和发生。

你可以在下面做 -

Select dept, count(*) cnt  
  from Table_name
 group by dept
having count(*) = ( select max(count(*)) from table_name group by dept)
union
select 'Other' dept, count(*) cnt 
  from table_name 
 where dept not in ( select dept 
                       from table_name 
                      group by dept 
                     having count(*) = ( select max(count(*)) 
                                           from table_name 
                                          group by dept
                                        )
                   )

我希望这就是你要找的......

Answer 3

SELECT 
     DEPT,
     COUNT (DEPT)AS [COUNT(DEPT)]
FROM(SELECT 
          (CASE DEPT WHEN 'D-1' THEN 'D-1' ELSE 'OTHERS' END) AS DEPT FROM test1) AS tbl
GROUP BY DEPT

请尝试以上sql查询。

数据库查询计数

3 个答案: