Search notes:

Oracle: V$SQL_FEATURE_DEPENDENCY

depend_on

There is only one «SQL feature» that does not depend on another feature, the following SQL statement returns only one record: 
select
   *
from
   v$sql_feature_dependency
where
   depend_on <> 'NONE';

See also

v$sql_feature v$sql_feature_hierarchy
Oracle Dynamic Performance Views

Index

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...', 1758205632, '216.73.216.150', 'Mozilla/5.0 App...', NULL) #2 /home/httpd/vhosts/renenyffenegger.ch/httpsdocs/notes/development/databases/Oracle/installed/dynamic-performance-views/sql/feature/dependency/index(48): insert_webrequest() #3 {main} thrown in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php on line 78