oracle技术
-
编辑 删除
merge into用法
作用：merge into 解决用B表跟新A表数据，如果A表中没有，则把B表的数据插入A表；语法：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 ! ]-------------------------------------实例-----------------------------------------------------------------m
