How do you find out who did not contribute to a particular fund raiser that we all just did?

Question

Using MYsql How do you find out who did not contribute to a particular fund raiser that we all just did. There are many titles to the different charities that is under the othpaytitle of the Otherpay table,  I however just want to extract the non-contributors for a particular charity title. Is there anyway to do this? When I do the the syntax below it comes up as an "empty set". The search is done by way of the table Id matching and left joins. Please see below.
SELECT  moiid, trim(concat(name.fname,' ' ,name.mname,' ',name.lname)) as Brother, name.moiid as Members_ID, sum(otherpay.othpayamt) as NO_Contribution, quadlt.ltfname as quad 
FROM name 
LEFT JOIN OTHERPAY  ON name.moiid = otherpay.othpaymoiid
LEFT JOIN quadlt  ON name.quadlt = quadlt.ltid
WHERE  Otherpay.othpaytitle like '%food drive%'
AND otherpay.othpaymoiid IS NULL
AND name.type = 'BOI'
AND name.type <> 'jrboi'
AND name.city = 'SUFFOLK'
GROUP BY brother
ORDER BY name.quadlt, brother

Answer 1

Just guessing based on your query,  and assuming the above query works, just insert a "where" condition. I also removed the SUM function. Also, "AND otherpay.othpaymoiid IS NULL"  may not be needed.
SELECT  moiid, trim(concat(name.fname,' ' ,name.mname,' ',name.lname)) as Brother, name.moiid as Members_ID, otherpay.othpayamt, quadlt.ltfname as quad
FROM name 
LEFT JOIN OTHERPAY  ON name.moiid = otherpay.othpaymoiid
LEFT JOIN quadlt  ON name.quadlt = quadlt.ltid
WHERE  Otherpay.othpaytitle like '%food drive%'
AND otherpay.othpaymoiid IS NULL
AND name.type = 'BOI'
AND name.type <> 'jrboi'
AND name.city = 'SUFFOLK'
AND othpayamt=0
ORDER BY name.quadlt, brother