I need your help. I have a query similar to the below with many more customer numbers. Records are showing but some of the customer numbers do not exists in the table, how can I modify the query below so it shows me the customers numbers that do not exist in the table.
Hope the above question makes sense.
where customer_number in ('45212', '85255','25887','4284JK','488555HJK','47852ETH','58641TYR','45870')