3

我是 T-SQL 命令的新手,MERGE所以我在我的 SQL 逻辑中找到了一个可以使用它并想要测试它的地方,但不知道我应该如何使用它:

IF (EXISTS (SELECT 1 FROM commissions_history WHERE request = @requestID))
    UPDATE commissions_history
    SET amount = @amount
    WHERE request = @requestID
ELSE
    INSERT INTO commissions_history (amount) VALUES @amount)

请提出正确的用法。谢谢!

4

2 回答 2

13

你看帮助了吗?这是一个简单的例子:

MERGE dbo.commissions_history AS target
USING (SELECT @amount, @requestID) AS source (amount, request)
ON (target.request = source.request)
WHEN MATCHED THEN
    UPDATE SET amount = source.amount
WHEN NOT MATCHED THEN
    INSERT (request, amount)
    VALUES (source.request, source.amount);
于 2010-06-03T16:39:34.040 回答
1

我希望它会工作

MERGE commissions_history AS target
USING (SELECT request FROM  commissions_history WHERE request = @requestID) AS source (request)
ON (target.request = source.request)
WHEN MATCHED THEN 
    UPDATE SET amount = @amount
WHEN NOT MATCHED BY SOURCE    
    INSERT (request, amount)
    VALUES (@requestID,  @amount)
于 2010-06-03T16:38:37.700 回答