Thank you Sean Lange

so by adding like this does help any way data retrival,

also one more doubt is, in this table (where i want to add primary key),

in the procedue (runs daily) loads data to the above table (several updates/deletes/inserts to this table)

does having pk at table level will be help full? or in the proc itself first remove pk then do several actions (DML) then add pk at end does better?

which one do you suggest

please help me...

thanks

dhanvi