// 1999 rules works fine, but that breaks other DBs. Sigh.
/// @todo Once we drop support for 1992-rule DBs, we can simplify this.
$dbType = $db->getType();
- if ( $dbType === 'mysql' || $dbType === 'sqlite' ||
- $dbType === 'postgres' && $db->getServerVersion() >= 9.1
- ) {
- // 1999 rules, or screw-the-rules
+ if ( $dbType === 'mysql' || $dbType === 'sqlite' ) {
+ // Ignore the rules, or 1999 rules if you count unique keys
+ // over non-NULL columns as satisfying the requirement for
+ // "functional dependency" and don't require including
+ // constant-in-WHERE columns in the GROUP BY.
+ $this->addOption( 'GROUP BY', array( 'page_title' ) );
+ } elseif ( $dbType === 'postgres' && $db->getServerVersion() >= 9.1 ) {
+ // 1999 rules only counting primary keys
$this->addOption( 'GROUP BY', array( 'page_title', 'page_id' ) );
} else {
// 1992 rules