And if you want to add more values to the existing Compression List, you can do it as under :
ALTER TABLE DBA_TEST_DB.TEST_COMPRESSION
ADD column_b DECIMAL(15,2) COMPRESS ( 0.00, 0.20 )
,ADD column_C DECIMAL(15,2) COMPRESS (0.00, 0.30 );
=> remember to include the existing values also with this command else they will be overwritten with new values.
--Cheers
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