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Garbage collector - MySQL

Hey all, I have a table, 'Objects', and a table 'Refs'. The table 'Refs' could have multiple rows which reference one object in 'Object'. What is the best way of finding the IDs of every Object which has no remaining references in 'Refs'? Cheers, Nicholas Sherlock...

  1. #1

    Default Garbage collector

    Hey all,

    I have a table, 'Objects', and a table 'Refs'. The table 'Refs' could
    have multiple rows which reference one object in 'Object'. What is the
    best way of finding the IDs of every Object which has no remaining
    references in 'Refs'?

    Cheers,
    Nicholas Sherlock
    Nicholas Sherlock Guest

  2. #2

    Default Re: Garbage collector

    "Nicholas Sherlock" <N.sherlock> wrote in message
    news:dsk7gn$j50$1lust.ihug.co.nz...
    > I have a table, 'Objects', and a table 'Refs'. The table 'Refs' could have
    > multiple rows which reference one object in 'Object'. What is the best way
    > of finding the IDs of every Object which has no remaining references in
    > 'Refs'?
    Gosh, this is a frequently asked question if I ever saw one.

    select objects.ids
    from objects left outer join refs on ...
    where refs.primarykey is null

    Regards,
    Bill K.


    Bill Karwin Guest

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