Summary of errors in Oracle database maintenance: MySQL

During the database maintenance process, you may encounter various errors. This article will summarize some common Oracle database errors and provide corresponding sample source code.

1. ORA-00904: invalid identifier
   Error description: This error indicates that an invalid column name or object name is referenced in the SQL statement.
   Sample code:

   SELECT invalid_column FROM employees;
   ```
   
   

2. ORA-00933: SQL command did not end correctly
   Error description: This error indicates that there is a syntactic problem with the SQL statement, which may be caused by missing keywords or incomplete end of the statement.
   Sample code:

   SELECT * FROM employees WHERE employee_id = ;