Error code
Oracle ORA-00904
ORACLEORA-00904
Database Error Code· An error code returned by a database server such as PostgreSQL or MySQL.
What it means
invalid identifier — the column or alias name is not recognized.
How to fix it
- Verify the column name against the table definition using DESC <table>.
- Check for case-sensitivity issues — Oracle stores unquoted identifiers in uppercase.
- Correct typos in the column name or alias in the SQL statement.
Not affiliated with Oracle. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
More Oracle codes
- ORA-00001unique constraint violated — duplicate value in unique index
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- ORA-00060deadlock detected while waiting for resource
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- ORA-00918column ambiguously defined — the column name matches more than one table in the query
- ORA-00933SQL command not properly ended — unexpected token at the end of the statement
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- ORA-00955name is already used by an existing object — DDL name conflict
- ORA-01017invalid username/password — logon denied
- ORA-01400cannot insert NULL into a NOT NULL column
- ORA-01403no data found — a SELECT INTO or FETCH returned no rows
- ORA-01422exact fetch returns more than requested number of rows — SELECT INTO got multiple rows