在“ case”表達式中使用“ in”語句

Question

如何在“ case表達式”中使用IN ？

這是我的查詢，我想如果算上任何比賽像mumbai然后發現為mumbai ：

 select TYPEOFPRODUCT,
        SUM(CASE(BRANCH) WHEN IN('Mumbai1' OR 'Mumbai2') THEN 1 ELSE 0 END) AS 'Mumbai'
        SUM(CASE(BRANCH) WHEN IN('Delhi1' OR 'DelhiMain') THEN 1 ELSE 0 END) AS 'Delhi'
from los_ext  
group by TYPEOFPRODUCT

Answer 1

親近了，您只需要用逗號分隔IN值而不是使用OR ，並且CASE表達式有兩種格式，將帶有條件的字段放在WHEN之后更加靈活，因此我更喜歡單獨使用它：

SELECT TYPEOFPRODUCT
      ,SUM( CASE WHEN BRANCH IN('Mumbai1','Mumbai2') THEN 1 ELSE 0 END) AS Mumbai
      ,SUM( CASE WHEN BRANCH IN('Delhi1', 'DelhiMain') THEN 1 ELSE 0 END) AS Delhi
FROM los_ext  
GROUP BY TYPEOFPRODUCT

Answer 2

它的查詢選擇各個分支的總和

select TYPEOFPRODUCT,
SUM(CASE WHEN (BRANCH = 'Mumbai1' OR BRANCH = 'Mumbai2' ) THEN 1 ELSE 0 END) AS 'Mumbai',
SUM(CASE WHEN (BRANCH = 'Delhi1' OR BRANCH = 'DelhiMain' )  THEN 1 ELSE 0 END) AS 'Delhi'
from los_ext  
group by TYPEOFPRODUCT