What does 'sql error: ora-00933: sql command not properly ended' mean?

This Oracle-specific error is caused by a syntax mistake in your SQL command. Example:

SELECT * FROM users WHERE username = 'JohnDoe'
ORDER BY id DESC LIMIT 10;

Solution:

-- Correct Oracle syntax would be
SELECT * FROM users WHERE username = 'JohnDoe'
ORDER BY id DESC FETCH FIRST 10 ROWS ONLY;

Ensure you're using the correct SQL syntax for your database system.