SQL Server 2008中的MERGE命令(zz)

SQL Server 2008可以执行TSQL的MERGE命令。用MERGE命令，只需一个语句就可以对行进行 UPDATE、INSERT或 DELETE。

DECLARE @t1 table(t varchar(max))
DECLARE @t2 table(t varchar(max))

INSERT INTO @t1
SELECT 'a' UNION ALL
SELECT 'b' UNION ALL
SELECT 'c'

INSERT INTO @t2
SELECT 'b' UNION ALL
SELECT 'c' UNION ALL
SELECT 'd'

MERGE @t1 AS t1
USING (SELECT t FROM @t2) AS t2
ON t1.t = t2.t
--WHEN MATCHED THEN
WHEN NOT MATCHED THEN
INSERT (t) VALUES(t);

SELECT * FROM @t1