MERGE INTO USING用法
MERGE INTO [your table-name] [rename your table here]
USING ( [write your query here] )[rename your query-sql and using just like a table] ON ([conditional expression here] AND [...]...)
WHEN MATHED THEN [here you can execute some update sql or something else ]
WHEN NOT MATHED THEN [execute something else here ! ]
例如:
MERGE INTO table1 a USING ( select id,name from table2) b ON (a.id=b.id)
WHEN MATHED THEN update set a.name=b.name
WHEN NOT MATHED THEN insert (id,name) values('id','name');
解析:
匹配table1 a,用b这个查询结果,用on建立联系,当匹配上用update,匹配不上用insert。
MERGE INTO USING用法
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转载自blog.csdn.net/qiuzhi__ke/article/details/103500165
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