How can I Ignore zero and negative number

Question

Where is the mistake in my query

SELECT @Total:=SUM(deposit-cost) as Total FROM `vendor_ledger` Where NOT @Total < 0 GROUP BY 
VDR_ID;

Anyone Please Help Me

Answer 1

If you want to ignore any zero or negative deposit-cost amounts in your sum() then use a WHERE condition:

SELECT SUM(deposit-cost) as Total 
FROM `vendor_ledger` 
WHERE deposit-cost > 0 
GROUP BY VDR_ID;

If, instead, you are wanting to ignore any Total where it's less than or equal to 0 then use a HAVING condition:

SELECT SUM(deposit-cost) as Total 
FROM `vendor_ledger` 
GROUP BY VDR_ID 
HAVING Total > 0;