public function getListTableConstraintsSQL($table)
{
$table = new Identifier($table);
$table = $this->quoteStringLiteral($table->getName());
return "SELECT\n quote_ident(relname) as relname\n FROM\n pg_class\n WHERE oid IN (\n SELECT indexrelid\n FROM pg_index, pg_class\n WHERE pg_class.relname = {$table}\n AND pg_class.oid = pg_index.indrelid\n AND (indisunique = 't' OR indisprimary = 't')\n )";
}