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  1. #1
    accessmatt is offline Competent Performer
    Windows 7 32bit Access 2010 32bit
    Join Date
    Aug 2011
    Posts
    199

    How many Unions can I make in a single query?


    Can we use Union to combine from more than two tables? Is there a limit on ow many?

  2. #2
    pbaldy's Avatar
    pbaldy is offline Who is John Galt?
    Windows XP Access 2007
    Join Date
    Feb 2010
    Location
    Nevada, USA
    Posts
    22,652
    I believe the limit is on the overall size of the query, not the number of unions, but don't quote me on that. I've done 15 or so for a specialized report.
    Paul (wino moderator)
    MS Access MVP 2007-2019
    www.BaldyWeb.com

  3. #3
    June7's Avatar
    June7 is offline VIP
    Windows 7 64bit Access 2010 32bit
    Join Date
    May 2011
    Location
    The Great Land
    Posts
    53,771
    I hit a limit of 50 SELECT lines in one UNION.
    How to attach file: http://www.accessforums.net/showthread.php?t=70301 To provide db: copy, remove confidential data, run compact & repair, zip w/Windows Compression.

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