Search notes:

ORA-01791: not a SELECTed expression

The following query throws a ORA-01791: not a SELECTed expression because the order by uses an expression which is not in the select list of the statement:

select distinct
   substr(object_name, 1, 3)
from
   user_objects
order by
   object_name;

Fatal error: Uncaught PDOException: SQLSTATE[HY000]: General error: 8 attempt to write a readonly database in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php:78 Stack trace: #0 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(78): PDOStatement->execute(Array) #1 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(30): insert_webrequest_('/notes/developm...', 1740463548, '18.118.163.233', 'Mozilla/5.0 App...', NULL) #2 /home/httpd/vhosts/renenyffenegger.ch/httpsdocs/notes/development/databases/Oracle/errors/ORA-01791_not-a-SELECTed-expression(42): insert_webrequest() #3 {main} thrown in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php on line 78

ORA-01791: not a SELECTed expression

See also