primary field

From: Date: Fri, 16 Feb 2001 20:55:10 +0000
Subject: primary field
Groups: php.db 
Request: Send a blank email to php-db+get-6696@lists.php.net to get a copy of this message
Does the first field in a form have special significance? Have two fields in table: last_name member_id member_id is key and autoincrement. mysql won't accept two last names as same when last_name is first field. when member_id is made first field, then can input same last name into last_name field. why is that?

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