Question

mySQL was doing fine until mySQLi was created :/

I’ve used mysql_fetch_array() before. However, when I use mysqli_fetch_array() {Notice “i”}, there is a problem getting results from an ASSOCIATIVE array when selecting from multiple tables. That is,

$query = "SELECT t1.id, t2.id FROM t1, t2 WHERE ...";
$result = mysqli_query($conn,$query);
//if num of rows check...
while($row = mysqli_fetch_array($result))
{ $first_id = $row['t1.id']; $second_id = $row['t2.id']; }

And, I’d get an error: Undefined index: t1.id (or t2.id).

Queries work fine if I was only selecting from t1 or t2 (not both) or if I was saying $row[‘id’]; instead of $row[‘t1.id’]; but then that doesn’t help in getting different fields from two tables with identical names

Please help.

Thanks! =)

Answer 1

Your code has problems separating t1.id and t2.id, the result will return them both as ‘id’.

Try renaming/aliasing the column(s) using AS in the query instead;

$query = "SELECT t1.id AS t1id, t2.id AS t2id FROM t1, t2 WHERE ...";
$result = mysqli_query($conn,$query);
//if num of rows check...
while($row = mysqli_fetch_array($result))
{ $first_id = $row['t1id']; $second_id = $row['t2id']; }