hi Jesper,
thanks a lot! That's what I want. thank u againCC: mysql@lists.mysql.com From: jes...@noggin.com.au Subject: Re: how to get the name of primary key ? Date: Mon, 1 Feb 2010 20:26:36 +1100 To: tx...@hotmail.com On 01/02/2010, at 7:33 PM, 曹凯 wrote: Hi all, if we just know the table name but don't know the name of primary key, is there any variables or constants could instead of the PK? for example: there is a table "game_log", and now I have the last inserted_id but don't know what its primary_id is, how can I "SELECT * FROM game_log WHERE this_table's_PK = last_inserted_id"? You can get the column name from the information schema, however that can't be used directly in another query in the way you've done in your example. E.g. game> SELECT COLUMN_NAME FROM information_schema.KEY_COLUMN_USAGE WHERE TABLE_SCHEMA = 'game' AND TABLE_NAME = 'game_log' AND CONSTRAINT_NAME = 'PRIMARY';+-------------+| COLUMN_NAME |+-------------+| GameLogID | +-------------+1 row in set (0.00 sec) where it is assumed the database name is "game". Hope that helps. Jesper _________________________________________________________________ Windows Live社区两周年，拿奖过新年！ http://events.livetome.cn/2010/2birthday
