Issues With Excluding Results From Subquery - sql

Question

I am attempting to retrieve a list of members (MEMBERS table) who have purchased (ARTRANS table) a product from one of three product categories (PRODUCTCATS table) during a specified period (a month) and then have not purchased a product from that category in the following period (month).
Both queries work by themselves but when I put them together I do not pull any results. PLEASE HELP!
SELECT MEMBERS.lname
, MEMBERS.fname
, MEMBERS.email
, PRODUCTS.scancode
, PRODUCTS.description
, ARTRANS.datetrans
, ARTRANS.memid
, ARTRANS.invoice
, ARTRANSITEMS.price
, ARTRANSITEMS.quantity
FROM PRODUCTS
INNER JOIN ARTRANSITEMS
ON PRODUCTS.productid = ARTRANSITEMS.productid
INNER JOIN ARTRANS
ON ARTRANSITEMS.transid = ARTRANS.transid
INNER JOIN PRODUCTCATS
ON PRODUCTS.productcatid = PRODUCTCATS.productcatid
INNER JOIN MEMBERS
ON ARTRANS.memid = MEMBERS.memid
AND NOT EXISTS (
SELECT M2.memid
FROM PRODUCTS AS P2
INNER JOIN ARTRANSITEMS AS ATI
ON P2.productid = ATI.productid
INNER JOIN ARTRANS AS ART2
ON ATI.transid = ART2.transid
INNER JOIN PRODUCTCATS AS PC2
ON P2.productcatid = PC2.productcatid
INNER JOIN MEMBERS AS M2
ON ART2.memid = M2.memid
WHERE (
P2.productcatid = '20'
OR P2.productcatid = '21'
OR P2.productcatid = '78'
)
AND (ART2.datetrans BETWEEN DATEADD(month, 1, #rvMonthOneStart) AND DATEADD(month, 1, #rvMonthOneEnd))
)
WHERE (
PRODUCTS.productcatid = '20'
OR PRODUCTS.productcatid = '21'
OR PRODUCTS.productcatid = '78'
)
AND (ARTRANS.datetrans BETWEEN #rvMonthOneStart AND #rvMonthOneEnd)

Answer 1

Try this....
SELECT MEMBERS.lname, MEMBERS.fname, MEMBERS.email, PRODUCTS.scancode
, PRODUCTS.description, ARTRANS.datetrans, ARTRANS.memid
, ARTRANS.invoice, ARTRANSITEMS.price, ARTRANSITEMS.quantity
FROM PRODUCTS
INNER JOIN ARTRANSITEMS ON PRODUCTS.productid = ARTRANSITEMS.productid
INNER JOIN ARTRANS ON ARTRANSITEMS.transid = ARTRANS.transid
INNER JOIN PRODUCTCATS ON PRODUCTS.productcatid = PRODUCTCATS.productcatid
INNER JOIN MEMBERS ON ARTRANS.memid = MEMBERS.memid
WHERE PRODUCTS.productcatid IN ('20' ,'21','78')
AND (ARTRANS.datetrans BETWEEN #rvMonthOneStart AND #rvMonthOneEnd)
AND NOT EXISTS (SELECT 1
FROM PRODUCTS AS P2
INNER JOIN ARTRANSITEMS AS ATI ON P2.productid = ATI.productid
INNER JOIN ARTRANS AS ART2 ON ATI.transid = ART2.transid
INNER JOIN PRODUCTCATS AS PC2 ON P2.productcatid = PC2.productcatid
INNER JOIN MEMBERS AS M2 ON ART2.memid = M2.memid
WHERE PRODUCTS.productcatid IN ('20' ,'21','78')
AND (ART2.datetrans BETWEEN DATEADD(month, 1, #rvMonthOneStart) AND DATEADD(month, 1, #rvMonthOneEnd))
AND M2.memid = MEMBERS.memid)