Thats what I was looking for.
On the other hand, I just tried to execute a possible SQL-injected query

$dbh->do( 'CREATE TABLE a (x INT) ; DROP TABLE a -- );' ) ;
// or
$dbh->do( 'CREATE TABLE a (x INT) ; DROP TABLE a' ) ;
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Both give an error. Is it a rookie SQL mistake or what. I'm confused now!!