Question

我有一个我想运行的SQL查询，并且如果我将参数标记为true，则想要向where子句添加内容。我不认为我需要两次相同的sql语句，但找不到这样做的方法。这就是我要的。

DECLARE @getShipped VARCHAR = 'false'; 

SELECT DISTINCT 
    Serial_No
INTO #Serials
FROM Part_v_Container_Change2 AS CC
WHERE Change_Date <= @dateEnding
   *** AND IF @getShipped = 'true' THEN CC.Container_Status = 'Shipped' ***

尝试过if语句和case语句但似乎无法使其工作？如果我没有，我只是不想重复sql。

Answer 1

尝试这样

DECLARE @getShipped VARCHAR(20) = 'false'; 

SELECT DISTINCT 
     Serial_No
INTO #Serials
FROM Part_v_Container_Change2 AS CC
WHERE Change_Date <= @dateEnding AND
   ((@getShipped = 'true' AND CC.Container_Status = 'Shipped') OR @getShipped = 'false')

Answer 2

尝试动态sql，如下所示

DECLARE @getShipped VARCHAR(20) = 'false'; 
DECLARE @sql NVARCHAR(255) = 'SELECT DISTINCT Serial_No INTO #Serials FROM Part_v_Container_Change2 AS CC
WHERE Change_Date <= ''' + + CONVERT(VARCHAR, @dateEnding, 101) + ''''

DECLARE @filter NVARCHAR(50) = ' AND CC.Container_Status = ''Shipped'''

IF @getShipped = 'true' 
    SET @sql = @sql + @filter

EXEC (@sql)

如何根据参数值

2 个答案: