Home Forums SQL Server 2008 SQL Server Newbies Add Many-to-Many all at once RE: Add Many-to-Many all at once

  • December 5, 2012 at 4:21 pm

    #1565963

    JimS-Indy (12/5/2012)

    @Jeff,

    I had a similar idea, basically using the identity column from the input table, I can insert that value into a spare column in each of the two item masters, then match them up to create the xref table entries, then delete the input identity value from the two item masters. I suspect it's the same as your GUID idea....

    Thanks.

    Either way will work. I guess my question would now be, do you really need a man-to-many relationship for this? If not, just leave the IDENTITY in the child table and eliminate the bridge table. I know that'll make some of the folks in favor of normalization cringe a bit but it is a worthwhile simplification.

    The reason why I used the GUID instead of an IDENTITY is so that I don't have to put an extra lock on the system to do the deletes on busy systems.

    --Jeff Moden

    RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
    First step towards the paradigm shift of writing Set Based code:
    ________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

    Change is inevitable... Change for the better is not.

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