Basic Database Question

From: Gavin D'Mello <gavin_d_at_tis.co.in>
Date: Wed, 15 May 2002 06:03:29 -0800
Message-ID: <F001.00461074.20020515060329@fatcity.com>

Strange problem with charactersetsHi I'm just about to ask a really trivial question which has never struck me before.

If i write a simple select like

select c.contentid from content c,
persusercontentassoc p,
teachercontentassoc t
where
t.contentid = c.contentid OR
p.contentid = c.contentid;

and if the table persusercontentassoc is empty no rows are returned. However, if i populate this table i get meaningful data. So what i'm asking is if any one table in a select contains no data will the select always return no rows ?

Thanks,

Gavin

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Author: Gavin D'Mello
  INET: gavin_d_at_tis.co.in

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