sql-order-by

I have the following query which works great in Postgres 9.1: SELECT users.id, GREATEST( COALESCE(MAX(messages.created_at), '2012-07-25 16:05:41.870117'), COALESCE(MAX(phone_calls.created_at), '2012-07-25 16:05:41.870117') ) AS latest_interaction FROM users LEFT JOIN messages ON users.id = messages.user_id LEFT JOIN phone_calls ON users.id = phone_calls.user_id GROUP BY users.id ORDER BY latest_interaction DESC LIMIT 5; But what I want to do is something like this: SELECT users.id, GREATEST( COALESCE(MAX(messages.created_at), '2012-07-25 16:05:41.870117'), COALESCE(MAX(phone_calls.created_at),

I noticed some repeating rows in a paginated recordset. When I run this query: SELECT "students".* FROM "students" ORDER BY "students"."status" asc LIMIT 3 OFFSET 0 I get: | id | name | status | | 1 | foo | active | | 12 | alice | active | | 4 | bob | active | Next query: SELECT "students".* FROM "students" ORDER BY "students"."status" asc LIMIT 3 OFFSET 3 I get: | id | name | status | | 1 | foo | active | | 6 | cindy | active | | 2 | dylan | active | Why does "foo" appear in both queries? Why does "foo" appear in both queries? Because all rows that are returned have the same value for the

The following code outputs in order of 1, 10, 11, 12 of id. I want to make it 1,2,3,4... Could anyone tell me what I should do please. $Q = $this->db->query('SELECT P.*, C.Name AS CatName FROM products AS P LEFT JOIN categories C ON C.id = P.category_id'); Thanks in advance. First, add an order by clause at the end: ORDER BY category_id If category_id is a string, then you must treat it like an integer. There are a few ways to do this. I usually add a zero. You can also cast it. ORDER BY category_id + 0 You can do an explicit cast by doing: ORDER BY CAST(category_id AS UNSIGNED INTEGER) But

how can i use union and order by in mysql ? select * from _member_facebook inner join _member_pts ON _member_facebook._fb_owner=_member_pts._username where _member_facebook._promote_point = 9 ORDER BY RAND() limit 2 UNION ALL select * from _member_facebook inner join _member_pts ON _member_facebook._fb_owner=_member_pts._username where _member_facebook._promote_point = 8 limit 3 give me error #1221 - Incorrect usage of UNION and ORDER BY any one can help ? Tudor Constantin Try with: ( select * from _member_facebook inner join _member_pts ON _member_facebook._fb_owner=_member_pts._username

This is kind of a noobish question, but it's one that I've never been given a straight answer on. Suppose I have a DB table with the following fields and values: | id | date_added | balance | +------------------------------------+ | 1 | 2009-12-01 19:43:22 | 1237.50 | | 2 | 2010-01-12 03:19:54 | 473.00 | | 3 | 2010-01-12 03:19:54 | 2131.20 | | 4 | 2010-01-20 11:27:31 | 3238.10 | | 5 | 2010-01-25 22:52:07 | 569.40 | +------------------------------------+ This is for a very basic 'accounting' sub-system. I want to get the most recent balance. The id field is set to auto_increment. Typically, I

I have a very large (80+ million row) de-normalized MySQL table. A simplified schema looks like: +-----------+-------------+--------------+--------------+ | ID | PARAM1 | PARAM2 | PARAM3 | +-----------+-------------+--------------+--------------+ | 1 | .04 | .87 | .78 | +-----------+-------------+--------------+--------------+ | 2 | .12 | .02 | .76 | +-----------+-------------+--------------+--------------+ | 3 | .24 | .92 | .23 | +-----------+-------------+--------------+--------------+ | 4 | .65 | .12 | .01 | +-----------+-------------+--------------+--------------+ | 5 | .98 | .45 | .65 | +