请阅读此处的文档：使用MERGE插入，更新和删除数据 [ ^ ]



要访问其他数据库中的表，请使用该表的全名：

Read the documentation here : Inserting, Updating, and Deleting Data by Using MERGE[^]

To access tables in other databases use the full name for that table :

select * from databasename.dbo.tablename 

; replace databasename and tablename with the ones you want