Question

我有一个查询如下。我想在行中返回每个文件名（alter.pdf，modify.pdf）的大小写值。

但是我只获得alter.pdf的案例值。

SELECT CASE WHEN COUNT(P.[packageid]) > 0 THEN 1 ELSE 0 END AS [VALUE]    
              FROM [Table_1] AS P    
              INNER JOIN    
       [Table_2] AS F on F.FileID = P.FileID  
        WHERE F.FileName IN('alter.pdf','modify.pdf')

Answer 1

我认为你正在寻找这样的东西：

SELECT  F.[FileName]
        , sum(CASE WHEN F.FileName = 'alter.pdf' THEN 1
               WHEN F.FileName = 'modify.pdf' THEN 1
               ELSE 0 
          END AS) [VALUE]             
FROM [Table_1] AS P    
INNER JOIN [Table_2] AS F on F.FileID = P.FileID  
WHERE F.FileName IN('alter.pdf','modify.pdf')
group by F.[FileName]

在使用sql的where条件中使用case来表示多个参数

1 个答案: