Top 10 SQL Errors
How to Fix Oracle ORA-00904: invalid identifier
Oracle cannot recognize a column name, alias, or identifier.
Example error message
ORA-00904: invalid identifierCommon causes
- The column name is misspelled.
- You used double quotes and changed case sensitivity.
- The alias is used in WHERE instead of ORDER BY.
- The identifier is too long or invalid.
Quick fix
SELECT name FROM users;Checklist
- Check spelling of table and column names.
- Check the correct database, schema, and table alias.
- Compare your SQL dialect: MySQL, PostgreSQL, SQL Server, Oracle, or SQLite.
- Run a very small SELECT query first, then add conditions step by step.