From: Christophe t...@stuxnet.org
To: mysql@lists.mysql.com
Cc:
Sent: Tuesday, 18 March 2014, 19:10
Subject: Precedence in WHERE clauses.
Hi list,
I'd like to get your advice about precedence in where clauses in MySQL
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Hi Christophe,
Considering the following simple query :
SELECT * FROM Status WHERE DWProcessed = 0 AND PreviousStatus NOT IN
('PENDING', 'ACCEPTED') AND SubscribeDate DATE_SUB(NOW(), INTERVAL 24
HOUR);
Which of these filters are processed first ?
I'd like the first filter
Am 19.03.2014 15:05, schrieb Morgan Tocker:
When a MySQL server receives a query, it goes through a process called query
optimization
and tries to determine the best way to execute it (based on availability of
indexes etc)
The order of the WHERE clause does not matter
that is simply not
Reindl,
The order of the WHERE clause does not matter
that is simply not true
otherwise that documentation would not exist
http://dev.mysql.com/doc/refman/5.5/en/multiple-column-indexes.html
Yes, the order of the columns in composite indexes *does matter*. This is a
different question
Am 19.03.2014 16:27, schrieb Morgan Tocker:
Reindl,
you can call me Harald
The order of the WHERE clause does not matter
that is simply not true
otherwise that documentation would not exist
http://dev.mysql.com/doc/refman/5.5/en/multiple-column-indexes.html
Yes, the order of the
G'morning
A function in a where equals what ?
On Wed, March 19, 2014 15:05, Morgan Tocker wrote:
Hi Christophe,
Considering the following simple query :
SELECT * FROM Status WHERE DWProcessed = 0 AND PreviousStatus NOT IN
('PENDING', 'ACCEPTED') AND SubscribeDate DATE_SUB(NOW(), INTERVAL
On 3/19/2014 7:27 PM, Mogens Melander wrote:
G'morning
A function in a where equals what ?
On Wed, March 19, 2014 15:05, Morgan Tocker wrote:
Hi Christophe,
Considering the following simple query :
SELECT * FROM Status WHERE DWProcessed = 0 AND PreviousStatus NOT IN
('PENDING',
