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Batch process

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Hi All, 

I am doing purge activity my sales table contains 5M records I am going to delete more than 1 year data (which was 3M) records so it was running more so I want to do batch wise deletion through plsql




 created or replace function data_purge() returns void as$$
Declare
Begin
Drop table test_old;
Create table test_old as select * from sales where bill_date<now() -interval '1 year';

Delete table sales where sales_id in (select sales_id from test_old;

End;
$$ language plpgsql;


Kindly guide me


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