SQL选择case语句

我使用SQL Server 2008 R2的我有存储过程是这样的：SQL选择case语句

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变量选择的时候才发现那么如果有2个可变运行选择的时候才发现，然后retrun的libelle retrun的libelle
其他
其他retrun“00”

似乎对LIBELLE

语法错误

有什么想法？

来源

2013-03-05 user1958628

Libelle的（）括号内只存在，但你要访问他们的外面。 – 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

我觉得是这样的：

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')

应涵盖所有的情况。（如果不能从您的查询，其中一个具有JOUR = @The_Jour和其他有JOUR = 0两个匹配行，那么你可以删除TOP 1和ORDER BY条款（请注意，我认为任何可能@The_Jour值> 0）

来源

2013-03-05 09:14:41

如果有一个行相匹配的顶部选择

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

来源

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

来源

2013-03-05 09:45:30

SQL选择case语句

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