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sql query to two databases

  • July 14, 2009 at 2:51 pm

    #212437

    I have tables in one database with a link being user_id field to other tables in another database.

    how do you connect two different databases to one query.

    ie databaseA and databaseB

  • July 14, 2009 at 4:09 pm

    #1024756

    Trout (7/14/2009)

    I have tables in one database with a link being user_id field to other tables in another database.

    how do you connect two different databases to one query.

    ie databaseA and databaseB

    the key is to use the fully qualified names of the tables in each of the databases

    SELECT *

    FROM databaseA.dbo.AllUsers FirstAlias

    LEFT OUTER JOIN databaseB.dbo.AllUsers SecondAlias

    ON FirstAlias.user_id = SecondAlias.user_id

    note you could do the same on a table on a different server, if you added that server as a linked server...then you would have a 4 part name:

    ServerName.DatabaseName.dbo.Tablename, for example.

    Lowell

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