php - select count 3 tables -

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this question has answer here:

i trying query 3 tables returning error. want code check 3 tables whether user registered in 1 of these tables if tries log in. please me i'm php beginner.

i following error:

warning: mysql_result() expects parameter 1 resource, boolean given in

this code:

//check user if exist      function user_exists($username){      $username = sanitize($username);      return (mysql_result(mysql_query("select count(`user_id`)   `users`,`admin`,`guest` `username` = '$username'"), 0) == 1) ? true : false;

it appears attempting grab 3 different tables using single select, cannot work.

i'd suggest trying use join , if unfamiliar (and in worst case), using 3 separate select queries achieve end goal.


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