一行多个case语句的SQL结果

Question

我有一个表，其中包含:

EXTDEP EXTCODE PRICE
200     10001   200
500     10001   25
600     10001   36

我想要的结果:

EXTCODE PRICE200 PRICE500 PRICE600
10001    200       25         36

我得到的结果:

EXTCODE PRICE200 PRICE500 PRICE600
10001    NULL      NULL        36
10001    NULL       25        NULL
10001    200       NULL       NULL  

我的代码:

SELECT  
      [ExtCode]

      case when extdep = '200' then price1 end as '200', 
      case when extdep = '500' then price1 end AS '500', 
      case when extdep = '600' then price1 end AS '600'

有什么想法吗？ :)

Answer 1

尝试将聚合应用于 CASE 语句:

SELECT  
      [ExtCode],

      MAX(case when extdep = '200' then price1 end) as '200', 
      MAX(case when extdep = '500' then price1 end) AS '500', 
      MAX(case when extdep = '600' then price1 end) AS '600'
FROM your_table
GROUP BY ExtCode