oracle


How to delete duplicate records with Blob column in Oracle


When I want to detect the duplicate records (with 3 columns A1, A2 and A3) in an oracle table, I could use below query:
Select A1, A2, A3,count(1)
from T
group by A1, A2, A3
having count(1) > 1;
But if A3 is Blob type, this query would return error message “ORA-00932: inconsistent datatypes: expected - got BLOB” because blob column could not be in group by statement.
Then how could we query the duplicate records with a Blob column?
Thanks a lot.

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