如何根据参数值添加到 Where 子句

Question

我有一个 sql 查询，我想要运行并且如果我将参数标记为 true，我想向 where 子句添加一些内容。我不认为我需要两次使用相同的 sql 语句，但找不到方法来做到这一点。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' ***

已经尝试过 if 语句和 case 语句，但似乎无法使它起作用？如果我没有的话，我只是不想重复 sql。

Answer 1

像这样尝试

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

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)

如何根据参数值添加到 Where 子句

How to add to Where clause depending on parameter value

sql-server

if-statement

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where-clause