Hi all,
i have a table (sales) that contain cust_id, item_id and item_qty.
example:
cust_id item_id item_qty
abc 100 100
abc 110 100
abc 120 100
abb 100 100
abb 120 100
abb 130 100
aba 110 100
aba 120 100
aba 130 100

how to make query that give result: customer abb (who not buy item 110)

Thanks for any help/ idea