How to insert the next highest number into the database

Question

I have a piece of mysqli code which I written where it will insert values into the database:

$insertsql = \"
INSERT INTO Teacher
    (TeacherId, TeacherForename,         


        

Answer 1

Well you can try this:

First get the total number of rows in the table and increment it by 1 and put that into your new id For example:

$selectUsers = mysql_query ("SELECT * FROM `Teacher`") or die(mysql_error());
$num_rows = mysql_num_rows($selectUsers);

$next_id = $num_rows+1;

$new_id = 'T'.$next_id ;

and after insert it into the table:

...