ORA-00911 errors and solutions (appendix to all ora error causes and solutions web site)

Today, I encountered a headache in the project,Oracle Database reports: ORA-00911 errors. The problem is as follows:

But I am running it in PL/SQL developer !!!

Where is the problem ???

After a long time, I found that the problem was after the SQL statement.The semicolon ";",Delete the semicolon to solve the problem ~

The problem is solved here, But LZ is a kindProgramEmployee, what should I do if I encounter other errors? I searched the internet and found a reliable website, which lists

ORA-00000 to ORA-99999 error cause, solution. The website URL is as follows: http://www.ora-code.com/