Connection failed : SQLSTATE[HY000] [1049] Unknown database 'data_delectable'

Fatal error: Uncaught Error: Call to a member function prepare() on null in /var/www/html/admin/query/lab.php:32 Stack trace: #0 /var/www/html/index.php(127): lab() #1 {main} thrown in /var/www/html/admin/query/lab.php on line 32