Is Null Clause Takes A Lot Of Time But Is Not Null Statement Not
i have a query which takes 1 and half minute to fully execute. This query is following which return 2 records
select o.id, o.number, o.timest, o.receiptno, o.canedit, o.sessionid, o.voidorder, o.cashchange,p.amount from orders o left join payments p on (o.id=p.oid) where p.amount is null
but if i remove the 'not' from where clause then it takes a fraction of seconds. query is following which takes fraction of second and it returns 3920 records
select o.id, o.number, o.timest, o.receiptno, o.canedit, o.sessionid, o.voidorder, o.cashchange,p.amount from orders o left join payments p on (o.id=p.oid) where p.amount is not null
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