----- Original Message ----- From: "Jigal van Hemert" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Thursday, November 18, 2004 4:28 AM Subject: efficient query for: "it's your birthday today"
> I have date of birth stored in a DATETIME column and need to find for which > persons a certain date is their birthday. > > I've tried so far: > > DATE_FORMAT (col, '%m%d') = '1107' => 0.2001 sec > > col LIKE '%-11-07%' => 0.1643 sec > > col RLIKE '-11-07' => 0.1702 sec > > Are there faster alternatives for MySQL 4.0.21 ? > I don't know if it is more efficient but I would write this query as follows, simply because it is easier to understand what it is doing when you look at it: select [whatever columns you want] from mytable where month(birthdate) = 11 and dayofmonth(birthdate) = 7; Rhino -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
