Learn the cause and how to unravel the ORA-00919 error message in Oracle.
When you come upon an ORA-00919 error, the following error message will appear:
ORA-00919: invalid function
You tried to call a function, but the title you used used to be no longer a legitimate Oracle function.
The option(s) to resolve this Oracle error are:
Correct the spelling of the Oracle characteristic that you desire to call.
View a complete listing of Oracle functions.
Try the usage of the twin table if you wish to name a function barring querying a table.
For example, if you had created a custom characteristic referred to as TestFunction and you wanted to call this function, you should attempt the following:
SELECT TestFunction() FROM dual;