Queries for Multiple Databases

  • I am trying to write a query that will search for databases created in the last week. Once I get that info I need to query all the databases returned for information in a table that they all will have.

    I know I can write the first part by querying sys.databases and using datediff to pull the ones created.

    I don't know how to take that list and query them all for information maintained in the specific table.

    exp..

    db1.table1

    db2.table1

    db3.table1

    all 3 tables would have info in one column that I'm trying to return.

    thanks for any help

  • Newbie Jones (5/8/2013)


    I am trying to write a query that will search for databases created in the last week. Once I get that info I need to query all the databases returned for information in a table that they all will have.

    I know I can write the first part by querying sys.databases and using datediff to pull the ones created.

    I don't know how to take that list and query them all for information maintained in the specific table.

    exp..

    db1.table1

    db2.table1

    db3.table1

    all 3 tables would have info in one column that I'm trying to return.

    thanks for any help

    You could use a cursor using the select statement you used against against sys.databases.

    There is definately a much better solution for this, this is just off the top of my head..

  • Here is one way to do this without a cursor. It has the additional advantage of putting all the results into a single table instead of 1 table for each database.

    declare @SQL nvarchar(max)

    select @SQL = STUFF((

    select 'UNION ALL select ''' + name + ''' as DBName, * from ' + name + '.dbo.table1 '

    from sys.databases

    where DATEDIFF(week, create_date, GETDATE()) < 1

    for xml path('')), 1, 0, ' ')

    select @SQL = stuff(@SQL, 1, 11, '') --This removes the UNION ALL at the beginning.

    select @SQL

    --sp_executesql @SQL

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