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$query = "   SELECT field1
...
$sth1 = $dbh->prepare($query) or die->$errstr();

$sth1->execute($valuesForIn) or die $dbh->errstr;

$query = "   SELECT field1
                FROM table1
...
$sth1 = $dbh->prepare($query) or die->$errstr();

$sth1->execute(1,2,3,4,5) or die $dbh->errstr;

"SELECT * FROM Customers
WHERE Country IN (SELECT Country FROM Suppliers)"