"John LYC" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> hi all,
>
> does mysql support this?
>
> select * from tablename where id in (select id from table2 where cond)
>
> thanks
>
No. MySQL does not support so-called sub-selects. Here's an easy workaround
in PHP:
$result = mysql_query("SELECT id FROM table2 WHERE cond");
$idlist = array();
while($row = mysql_fetch_assoc($result)) {
$idlist[] = $row[id];
}
$result = mysql_query("SELECT id FROM table1 WHERE id IN(" . implode(", ",
$idlist) . ")");
Making sure $idlist actually contains at least one item (if it doesn't the
second query will fail) is left as an exercise to the reader.
--
- Daniel Grace <http://dewin.oldbattery.com/>
"Space may be the final frontier but its made in a Hollywood basement."
- Red Hot Chili Peppers - Californication
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