WHERE not exist not working

So I am adding user data from a table to another for a WordPress’s plugin

$sql = mysql_query("INSERT INTO wp_bp_xprofile_data (user_id, field_id, value)
        SELECT ID, '7', cedula
FROM employees

                 FROM wp_bp_xprofile_data
                 WHERE (ID=user_id AND
                       '7'=field_id AND

The Query runs fine, but when ran a second/third… time, it duplicayes all the data I’m pulling from the employees table into xprofile. With the ‘Where Not Exists’ I want each employee data to be added only once if it doesn’t exist already.

This is weird and can’t really figure out what’s wrong, even in an early query for another table, it doesn’t duplicate the employees and works right, here I’m pulling data from wp_users into wp_usermeta:

    $sql2 = mysql_query("INSERT INTO wp_usermeta (user_id, meta_key, meta_value)
        SELECT ID, 'first_name', SUBSTRING_INDEX(display_name, ' ', 1)
FROM wp_users

                 FROM wp_usermeta
                 WHERE (ID=user_id AND
                       'first_name'=meta_key AND
                       SUBSTRING_INDEX(display_name, ' ', 1)=meta_value 

On this one, it won’t duplicate the records when ran again if the records are already in, if anyone can see what’s wrong, your help would be really appreciated.


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