Hi fellow PostgreSQL users.
Here's a query:
DELETE FROM Annonces WHERE Id_Ag IN
(
SELECT Id FROM Installs
WHERE Si_Compte_Actif = 'f'
);
This query will take more than one hour of CPU time
on a PII 333 to execute. Table Installs has about 3000
tuples, and table Annonces about 50.000 .
Fabrice Scemama wrote:
Hi fellow PostgreSQL users.
Here's a query:
DELETE FROM Annonces WHERE Id_Ag IN
(
SELECT Id FROM Installs
WHERE Si_Compte_Actif = 'f'
);
The IN Clause is known to be very very slow. Use the
EXISTS Clause instead.
Regards Herbie
--
Fabrice Scemama wrote:
DELETE FROM Annonces WHERE Id_Ag IN
(
SELECT Id FROM Installs
WHERE Si_Compte_Actif = 'f'
);
This query will take more than one hour of CPU time
Any ideas about a way to write a single query that fast ?
- Original Message -
From: "Fabrice Scemama" [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Thursday, April 06, 2000 4:03 PM
Subject: [GENERAL] Accelerating subqueries
Hi fellow PostgreSQL users.
Here's a query:
DELETE FROM Annonces WHERE Id_Ag IN
(
SELECT Id FRO
