Compare CLOBs in a query

Hi Guys
How is it possible to compare CLOBs (as a column data) coming in query result and further filter the same query to excluding the excatly similar CLOBs.
Cheers
Shabar
Edited by: shabar on Jun 15, 2011 12:47 AM

you could use dbms_lob.compare().
Something like this:
SQL> create table clob_test
2   (
3    clb1 clob, clb2 clob
4   ) ;
Table created.
SQL> insert
2 into clob_test values
3   (
4    'matching', 'matching'
5   ) ;
1 row created.
SQL> insert
2 into clob_test values
3   (
4    'matching', 'not matching'
5   ) ;
1 row created.
SQL> select *
2 from clob_test
3 Where Dbms_Lob.Compare(Nvl(Clb1,'NULL'),Nvl(Clb2,'NULL')) = 0;
CLB1                  CLB2
matching              matching
1 row selected.Vivek L

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