Fatal error: Uncaught PDOException: SQLSTATE[42601]: Syntax error: 7 ERROR: syntax error at or near "UNION" LINE 20: UNION ALL ^ in /var/www/html/certificati_test/src/utils.php:235 Stack trace: #0 /var/www/html/certificati_test/src/utils.php(235): PDOStatement->execute() #1 /var/www/html/certificati_test/public/index.php(21): ratings_top_by_avg(50) #2 {main} thrown in /var/www/html/certificati_test/src/utils.php on line 235