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  2. MIDRANGE-L
  3. December 2007

RE: SQL descending primary key

Walden,

That's good information.

So if I create a table with a Primary Key of something, say
Contract_Number, do you recommend creating a separate index with the same
key?

Tks,

Glenn Gundermann
ggundermann@xxxxxx
(647) 272-3295

You want an index, not the Primary Key clause. Technically the "primary
key" is neither ascending nor descending. Primary Key tells SQL that the
field (or collection of fields) uniquely identifies the row. There is
nothing about the Primary Key clause (in SQL-speak) that forces an index
to be created at all. Now, it's an obvious implementation artifact that
Primary Key creates an index to ensure uniqueness, but if the DMBS could
figure out a way to ensure uniqueness w/out an index it would be free to
do so.

-Walden

--
Walden H Leverich III
Tech Software
(516) 627-3800 x3051
WaldenL@xxxxxxxxxxxxxxx
http://www.TechSoftInc.com

Quiquid latine dictum sit altum viditur.
(Whatever is said in Latin seems profound.)

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