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06-01-2010, 04:20 PM
Join Date: Feb 2010
As I remember from
there may be additional fields on table 'X', which means that the database update routine will have to deal with more than simply choosing between an insert or a delete.
A more complicated version is where table 'X' can contain multiple occurrences for each combination of 'a_id' and 'b_id'.
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