Should you ever labored with Oracle Database, then you definately would positively come throughout ORA-00904: invalid identifier error, regardless of the matter with the model on which you might be working like 10g, 11g, or 12g, and is most distinguished error comes whereas doing CRUD (create, learn, replace and delete) operation in Oracle. What ought to be achieved on getting this error throughout SQL script? Invalid identifier signifies that column title entered is both lacking or invalid, since this not the one error that happens with SQL script however is among the commonest. This text is all concerning the resolution as a way to eliminate this error. Reason for error: Under are few causes that result in error ORA-00904 or Invalid Identifier; Cause 1: On account of further comma ultimately column An additional comma on the finish of create desk assertion can result in “ORA-00904 or “invalid identifier”, and is by far noticed as a most common reason. It creeps in as a result of copy and paste culture, because mostly users while copying do not pay attention in between commas and Oracle expects another column declaration after comma. So it’s better to explicitly check the last column declaration rather than finding it while running query against database. Reason 2: Due to incorrect column name in DELETE query Similarly to previous example of SELECT and UPDATE query, you will also face “ORA-00904: invalid identifier” if you give wrong column name in DELETE statements. It could be due to typo of recent update in schema which dropped the column you are using in your DELETE clause. Reason 3: Invalid identifier While Inserting data into Table Apart from table creation, you will see error “ORA-00904: invalid identifier” for those who use improper column title in INSERT assertion or use a non-existent column title. More often than not it occurs due to typo, however another time it could possibly be on account of parallel replace e.g. somebody modified the schema of desk and renamed or dropped the column you might be referring in INSERT question. If nonetheless you aren’t in a position to Oracle Database even after following above steps, then you may go for a restoration software that’s Oracle File Restore software. This software will help you to get well all recordsdata and objects from Oracle database. It not solely helps Oracle 11G model however can also be appropriate with different model of Oracle. It scans the database deeply and if there’s any error or corruption it fixes them and restores the info.