ORA-00911 during addition of comment in the SQL command.

I work within the ORACLE Database Express Edition page "SQL Command".

The following query works fine for me:

SELECT *.
CUSTOMERS

As soon as I add comments, I get an error ORA-00911:

-It is a comment.
--
SELECT *.
CUSTOMERS

ORA-00911: invalid character

Hello

Apex SQL worksheet don't like comments. What is reason you like add comments when you run the query?
You can try

SELECT *
/*This is a comment.*/
FROM CUSTOMERS

Kind regards
Jari

Tags: Database

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