Re: join in SQL

Hi,
Just for my information :

Not dangerous to select NULL ?
I think that selecting just one character is more accurate. No ?

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REIP Jean-Claude
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Thomas Kyte wrote in message <346bf4ae.182997937_at_newshost>...


> ....

>   and not exists ( select NULL

>                      from B

>                     where b.c_id = c.id and b.a_id = a.id )

>/

>

>is one way to do it I believe...