Question

I have many rows in Sale, and one Row in SalesProcessed.

SELECT * FROM Sale 
    INNER JOIN SalesProcessed
    ON Sale.id<>SalesProcessed.id
    LIMIT 0,30

This code returns same row which id is in SalesProcessed. Why?

Actually I need Sale rows which ID’s doesn’t exist in SalesProcessed.

Answer 1

SELECT *
    FROM Sale
        LEFT JOIN SalesProcessed
            ON Sale.id = SalesProcessed.id
    WHERE SalesProcessed.id IS NULL
    LIMIT 0,30