本文介紹了T-SQL 中的 case 語句中斷的處理方法，對大家解決問題具有一定的參考價值，需要的朋友們下面隨著小編來一起學習吧！
問題描述
是否可以在 mssql 中的 case 語句中使用 break 命令?
Is possible using break command in case statement in mssql?
因為條件是驗證表達式GO，而不是做下一個CASE的轉換.ssip_miktar 為 5，ssip_teslim_miktar 為 0，S74MIKTAR 為 5
Because the condition is verified that expression GO, instead of doing the next CASE's transition.
ssip_miktar is 5, ssip_teslim_miktar is 0 and S74MIKTAR is 5
update set ssip_teslim_miktar= ssip_teslim_miktar+
CASE WHEN ssip_miktar<@S74MIKTAR AND ssip_teslim_miktar=0 THEN @S74MIKTAR-ssip_miktar
WHEN ssip_miktar<@S74MIKTAR AND ssip_teslim_miktar>0 THEN @S74MIKTAR-(ssip_miktar+ssip_teslim_miktar)
WHEN ssip_miktar=@S74MIKTAR AND ssip_teslim_miktar=0 THEN @S74MIKTAR
WHEN ssip_miktar=@S74MIKTAR AND ssip_teslim_miktar>0 THEN @S74MIKTAR-ssip_teslim_miktar
WHEN ssip_miktar>@S74MIKTAR AND ssip_teslim_miktar=0 THEN @S74MIKTAR
WHEN ssip_miktar>@S74MIKTAR AND ssip_teslim_miktar>0 THEN @S74MIKTAR
END,
@S74MIKTAR=@S74MIKTAR-CASE
WHEN ssip_miktar<@S74MIKTAR AND ssip_teslim_miktar=0 THEN @S74MIKTAR-ssip_miktar
WHEN ssip_miktar<@S74MIKTAR AND ssip_teslim_miktar>0 THEN @S74MIKTAR-(ssip_miktar+ssip_teslim_miktar)
WHEN ssip_miktar=@S74MIKTAR AND ssip_teslim_miktar=0 THEN @S74MIKTAR
WHEN ssip_miktar=@S74MIKTAR AND ssip_teslim_miktar>0 THEN @S74MIKTAR-ssip_teslim_miktar
WHEN ssip_miktar>@S74MIKTAR AND ssip_teslim_miktar=0 THEN @S74MIKTAR
WHEN ssip_miktar>@S74MIKTAR AND ssip_teslim_miktar>0 THEN @S74MIKTAR
ELSE 0
END
where ssip_teslim_miktar<ssip_miktar
推薦答案
你不應該使用 break 因為 SQL Case 語句不會失敗.
You shouldn't need to use a break because SQL Case statements don't fall through.
DECLARE @x int
SET @x = 0
SELECT CASE
WHEN @x = 0 THEN 'zero' -- Only this line of the expression is evaluated
WHEN @x <> 0 THEN 'not-zero'
END
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