datetime-generation

I am doing a query to get the number of builds per day from our database for the last 30 days. But it has become needed to marked days where there were no builds also. In my WHERE clause I use submittime to determine whether there were builds, how could I modify this to include days that have COUNT(id) == 0 but only in the last 30 days. Original Query: SELECT COUNT(id) AS 'Past-Month-Builds', CONCAT(MONTH(submittime), '-', DAY(submittime)) as 'Month-Day' FROM builds WHERE DATE(submittime) >= DATE_SUB(CURDATE(), INTERVAL 30 day) GROUP BY MONTH(submittime), DAY(submittime); What I've Tried:

I have the following schema. Table votes +------------------+--------------+------+-----+---------------------+----------------+ | Field | Type | Null | Key | Default | Extra | +------------------+--------------+------+-----+---------------------+----------------+ | id | int(10) | NO | PRI | NULL | auto_increment | | aid | varchar(10) | NO | | | | | ip | varchar(100) | NO | | | | | host | varchar(200) | NO | | | | | timestamp | varchar(20) | NO | | 0000-00-00 00:00:00 | | | user | tinytext | NO | | NULL | | | userid | int(10) | NO | | 0 | | +------------------+--------------+------+-----+-----

I have a query that groups all entries from a table and groups them by the datetime column. This is all working great: SELECT SUM( `value` ) AS `sum` , DATE(`datetime`) AS `dt`` FROM `entry` WHERE entryid = 85 AND DATETIME BETWEEN '2010-01-01' AND '2010-03-01' GROUP BY `dt` ORDER BY `datetime` The problem is, I need it to return a row even if nothing is found, with the value set to 0. I assume there's some MYSQL function that'll take care of this but can't seem to find it. Thanks! MySQL doesn't have recursive functionality, so you're left with using the NUMBERS table trick - Create a table