It's created when that field is the first field in a multi-field index. For example:
mysql> describe mytable; +-------+---------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------+---------+------+-----+---------+-------+ | id | int(11) | YES | | NULL | | | val | char(5) | YES | | NULL | | +-------+---------+------+-----+---------+-------+ 2 rows in set (0.38 sec) mysql> alter table mytable add index qq(id,val); mysql> describe mytable; +-------+---------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------+---------+------+-----+---------+-------+ | id | int(11) | YES | MUL | NULL | | | val | char(5) | YES | | NULL | | +-------+---------+------+-----+---------+-------+ 2 rows in set (0.00 sec) -----Original Message----- From: Shon Stephens [mailto:[EMAIL PROTECTED]] Sent: Friday, February 01, 2002 10:24 AM To: [EMAIL PROTECTED] Subject: what type of key is this? i have been asked to create an sql table with a certain structure. i was sent a description of the table. the first column is desribed as having a "MUL" key. i don't now what that is or how to create it. can someone please help. thanks, shon --------------------------------------------------------------------- Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail <[EMAIL PROTECTED]> To unsubscribe, e-mail <[EMAIL PROTECTED]> Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php --------------------------------------------------------------------- Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail <[EMAIL PROTECTED]> To unsubscribe, e-mail <[EMAIL PROTECTED]> Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
