Question

The first column in my MySQL table contains an auto increment ID. I would like to enter this value into another column when inserting a new row into the table, i.e. I need to read the value in the ID column and insert it into the next column.

Is it possible to do this, and if so, how?

Answer 1

I’m sure some of the above answers work, but I wasn’t able to work out how to implement them. I did however successfully implement a solution using $pdo->lastInsertId(), i.e. after executing my INSERT query I added:

$new_id = $pdo->lastInsertId();

$sth2 = $pdo->prepare("UPDATE `tracks` SET `fav_id`= IF(`fav_id`=0,$new_id,fav_id) WHERE `id`=$new_id");
$sth2->execute();

And this sets the fav_id column of the last inserted row to the same value as the id column for this row, if fav_id has not already been set.