$start = $dbw->selectField( $table, "MIN($idCol)", false, __METHOD__ );
$end = $dbw->selectField( $table, "MAX($idCol)", false, __METHOD__ );
if ( !$start || !$end ) {
$start = $dbw->selectField( $table, "MIN($idCol)", false, __METHOD__ );
$end = $dbw->selectField( $table, "MAX($idCol)", false, __METHOD__ );
if ( !$start || !$end ) {