SQL選擇case語句

我使用SQL Server 2008 R2的我有存儲過程是這樣的：SQL選擇case語句

CREATE PROCEDURE Get_Code_Tourne_Matin 
    -- Add the parameters for the stored procedure here 
@The_FA int, 
@The_Jour int, 
@The_Insee varchar(10) 
AS 
BEGIN 
declare @TheCode varchar(250) 


set @TheCode = case 
    when exists (SELECT T_TOURNE_LABEL.LIBELLE 
        FROM TOURNE 
        LEFT JOIN T_TOURNE_LABEL ON TOURNE.LIB_TOURNE = T_TOURNE_LABEL.NOID 
        WHERE THE_FA = @The_FA AND 
         NO_INSEE = @The_Insee AND 
         JOUR = @The_Jour AND 
         (datepart(hh, LE_HEURE) between 13 and 23 or datepart(hh, LE_HEURE) between 0 and 6)) then LIBELLE 
    when exists (SELECT LIBELLE 
        FROM TOURNE 
        LEFT JOIN T_TOURNE_LABEL ON TOURNE.LIB_TOURNE = T_TOURNE_LABEL.NOID 
        WHERE THE_FA = @The_FA AND 
         NO_INSEE = @The_Insee AND 
         JOUR = 0 AND 
         (datepart(hh, LE_HEURE) between 13 and 23 or datepart(hh, LE_HEURE) between 0 and 6)) then LIBELLE 
    else '00' 


    end 


RETURN @TheCode 
END

我只是想返回libelle。
先用3變量選擇的時候才發現那麼如果有2個可變運行選擇的時候才發現，然後retrun的libelle retrun的libelle
其他
其他retrun「00」

似乎對LIBELLE

語法錯誤

有什麼想法？

來源

2013-03-05 user1958628

Libelle的（）括號內只存在，但你要訪問他們的外面。 – 2013-03-05 09:11:36

（用'JOUR = @ The_Jour'），莫不是也是一行'JOUR = 0'？ – 2013-03-05 09:12:08

我覺得是這樣的：

set @TheCode = COALESCE(
(SELECT TOP 1 T_TOURNE_LABEL.LIBELLE 
        FROM TOURNE 
        LEFT JOIN T_TOURNE_LABEL ON TOURNE.LIB_TOURNE = T_TOURNE_LABEL.NOID 
        WHERE THE_FA = @The_FA AND 
         NO_INSEE = @The_Insee AND 
         (JOUR = @The_Jour OR JOUR = 0) AND 
         (datepart(hh, LE_HEURE) between 13 and 23 or datepart(hh, LE_HEURE) between 0 and 6) 
ORDER BY JOUR DESC), '00')

應涵蓋所有的情況。（如果不能從您的查詢，其中一個具有JOUR = @The_Jour和其他有JOUR = 0兩個匹配行，那麼你可以刪除TOP 1和ORDER BY條款（請注意，我認爲任何可能@The_Jour值> 0）

來源

2013-03-05 09:14:41

如果有一個行相匹配的頂部選擇

set @TheCode =( SELECT ISNULL((SELECT TOP 1 T_TOURNE_LABEL.LIBELLE 
       FROM TOURNE 
       LEFT JOIN T_TOURNE_LABEL ON TOURNE.LIB_TOURNE = T_TOURNE_LABEL.NOID 
       WHERE THE_FA = @The_FA AND NO_INSEE = @The_Insee AND JOUR = @The_Jour 
           AND (DATEPART(hh, LE_HEURE) BETWEEN 13 AND 23 
           OR DATEPART(hh, LE_HEURE) BETWEEN 0 AND 6 
           )), '00') AS LIBELLE

來源

2013-03-05 09:31:39

CREATE PROCEDURE Get_Code_Tourne_Matin 
@The_FA int, 
@The_Jour int, 
@The_Insee varchar(10) 
AS 
BEGIN 
declare @TheCode varchar(250) 
    Set @TheCode = ''; 
    SELECT top 1 @TheCode = T_TOURNE_LABEL.LIBELLE 
      FROM TOURNE 
      LEFT JOIN T_TOURNE_LABEL ON TOURNE.LIB_TOURNE = T_TOURNE_LABEL.NOID 
      WHERE THE_FA = @The_FA AND 
       NO_INSEE = @The_Insee AND 
       (JOUR = @The_Jour or JOUR = 0)AND 
       (datepart(hh, LE_HEURE) between 13 and 23 or datepart(hh, LE_HEURE) between 0 and 6) 

    set @TheCode = case 
     when len(@TheCode) > 0 
     when exists (SELECT @TheCode) 
     else '00' 

     end 
    RETURN @TheCode 
END

來源

2013-03-05 09:45:30

SQL選擇case語句

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