On 28 Mar 2014, at 1:12am, SongbookDB <[email protected]> wrote:

> However, if, for example the DiscId is blank, but the artist and title are
> not, a new record is created when there is already one with a blank DiscId
> and the same artist and title - BAD.

What's the primary key on that TABLE ?  Include both the column name and the 
column's affiliation.

Simon.
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