Re: Advice on SQL and records
From: Paul <paul_at_see.my.sig.com>
Date: Tue, 23 Aug 2005 17:06:42 +0100
Message-ID: <h7img1512u15iktiiqf4n72lmlertsmnt4_at_4ax.com>
Date: Tue, 23 Aug 2005 17:06:42 +0100
Message-ID: <h7img1512u15iktiiqf4n72lmlertsmnt4_at_4ax.com>
"David Cressey" <david.cressey_at_earthlink.net> wrote:
> > What does "cardinality" mean? What's an "optimizer"?
> The cardinality of that table is the number of rows in the table.
Surely you mean records, or tuples? Rows are for spreadsheets.
> The order of a table is the number of columns in it.
> "order" is a poor choice of terminology, since many people will read it as
> "Sort order".
That's maths for you - not always intuitive.
Paul...
-- plinehan __at__ yahoo __dot__ __com__ XP Pro, SP 2, Oracle, 9.2.0.1.0 (Enterprise Ed.) Interbase 6.0.1.0; When asking database related questions, please give other posters some clues, like operating system, version of db being used and DDL. The exact text and/or number of error messages is useful (!= "it didn't work!"). Thanks. Furthermore, as a courtesy to those who spend time analysing and attempting to help, please do not top post.Received on Tue Aug 23 2005 - 18:06:42 CEST