On Wed, 13 Dec 2006, RB Smissaert wrote:
Trying to find the fastest way to determine if a table has no rows.
I think this will do:
SELECT (SELECT ROWID FROM table limit 1) IS NOT NULL;
If a table has rows then the result should be 1.
RBS
About a month ago, I sought a better solution than what I had devised.
Here's one of the answers for you:
You could write
select exists (select * from <table> where <fieldname>='<something>');
This produces a singleton result (single row, single column). The only cell
of this result contains integer 1 if there are indeed rows with
<fieldname>='<something>' in table component, and 0 if there are none.
I still don't understand why you want to "look before you leap", so to
speak. Why not just run the query
select * from <table> where <fieldname>='<something>';
and handle the case where it produces an empty result set?
Rich
--
Richard B. Shepard, Ph.D. | The Environmental Permitting
Applied Ecosystem Services, Inc.(TM) | Accelerator
<http://www.appl-ecosys.com> Voice: 503-667-4517 Fax: 503-667-8863
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