Обсуждение: NOT IN doesn't use index?

I have been looking through the archives but can't find anything on this.

Does the use of WHERE field  NOT IN ('A','B' etc) prevent the use of an
index?
Would changing the query to WHERE field <> 'A' and field <> 'B' etc help?

The query only involves one table, and this is the only field in the where
clause.  Explain plan indicates a Sort and Seq Scan are being done.

THanks

On Sat, May 03, 2003 at 01:56:02AM -0400, Becky Neville wrote:
> Does the use of WHERE field  NOT IN ('A','B' etc) prevent the use of an
> index?

That '&c.' is hiding a lot.  Why not post your query and the explain
analyse output?

A
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