Extracting Member who did not contribute - mysql

Question

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, 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

When you add conditions to the where clause for tables that are left joined, you effectively turn them into an inner join, requiring them to return records.
You can move the conditions to the join itself:
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
AND Otherpay.othpaytitle like '%food drive%'
LEFT JOIN quadlt ON name.quadlt = quadlt.ltid
WHERE
otherpay.othpaymoiid IS NULL
AND name.type = 'BOI'
AND name.type <> 'jrboi'
AND name.city = 'SUFFOLK'
GROUP BY brother
ORDER BY name.quadlt, brother