如何把這個整個SQL查詢內CASE語句

查詢寫入case內運行正常，當我運行它沒有使用開關的情況下，但是當我把這個查詢的情況下，它開始給錯誤我怎麼能改變我的查詢裏面的開關情況下運行如何把這個整個SQL查詢內CASE語句

Declare @number int 
set @number = 1 


SELECT 
    CASE @number 
     WHEN 1 THEN (SELECT  
         userId, checkfreeId, role, buname, fiservEmailId 
        FROM  
         (SELECT  
          tbl_buLogin.userId, tbl_buLogin.checkfreeId, 
          tbl_buroles.role, tbl_bu.buname, 
          tbl_buLogin.fiservEmailId 
         FROM   
          tbl_buLogin 
         INNER JOIN 
          tbl_buroles ON tbl_buLogin.roleId = tbl_buroles.id 
         INNER JOIN 
          tbl_userbujoin ON tbl_userbujoin.userId = tbl_buLogin.userId 
         INNER JOIN 
          tbl_bu ON tbl_bu.buid = tbl_userbujoin.buId 
            AND tbl_bu.buid IN (SELECT tbl_userbujoin.buId 
                 FROM tbl_buLogin 
                 INNER JOIN tbl_userbujoin ON tbl_buLogin.userId = tbl_userbujoin.userId 
                 WHERE tbl_buLogin.checkfreeId = 'testiso') 
         UNION 
         SELECT  
          tbl_buLogin_2.userId, tbl_buLogin_2.checkfreeId, tbl_buroles_1.role, tbl_bu_1.buname, tbl_buLogin_2.fiservEmailId 
         FROM   
          tbl_buLogin AS tbl_buLogin_2 
         INNER JOIN 
          tbl_buroles AS tbl_buroles_1 ON tbl_buLogin_2.roleId = tbl_buroles_1.id 
         INNER JOIN 
          tbl_bu AS tbl_bu_1 ON tbl_bu_1.buid = tbl_buLogin_2.buId 
               AND tbl_bu_1.buid IN (SELECT tbl_userbujoin.buId 
                     FROM tbl_buLogin 
                     INNER JOIN 
                      tbl_userbujoin on tbl_buLogin.userId = tbl_userbujoin.userId 
                     WHERE tbl_buLogin.checkfreeId = 'testiso') 

         WHERE  
          (tbl_buLogin_2.userId NOT IN (SELECT  tbl_userbujoin_1.userId 
                  FROM tbl_buLogin AS tbl_buLogin_1 
                  INNER JOIN tbl_userbujoin AS tbl_userbujoin_1 ON tbl_userbujoin_1.userId = tbl_buLogin_1.userId))) AS tbl 
       ORDER BY role) 
     ELSE 'NO' 
    END

來源

2016-08-16 Ashu

非常亂碼後，我建議IF/ELSE IF - CASE不是流動的控制。 –

T-SQL中的CASE是*表達式*（如'a + b'） - ** NOT **語句！ 'CASE'最終將返回**一個單一的原子值** - 它是** NOT **旨在交替執行一組代碼或另一組代碼 –

爲什麼不使用IF-ELSE

IF @number = 1 THEN 
BEGIN 
    --your Query here 
END 
ELSE 
    SELECT 'NO'

來源

2016-08-16 15:23:11

如何把這個整個SQL查詢內CASE語句

回答

相關問題