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Don Burleson Blog 







ORA-00997 Illegal use of long datatype tips

Oracle Tips by Burleson Consulting

February 12, 2010

Question:  I am running a SQL and I get an ORA-00997 error.  What causes this ORA-00997 error?

Answer:  Oracle provides alternatives to the long and long raw datatypes, specialized long column datatypes such as the clob (character large object) and blob datatypes.  The documentation notes this on the OA-00997 error:

ORA-00997: illegal use of LONG datatype
Cause: A value of datatype LONG was used in a function or in a DISTINCT, WHERE, CONNECT BY, GROUP BY, or ORDER BY clause. A LONG value can only be used in a SELECT clause.
Action: Remove the LONG value from the function or clause. 




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