Question

I have written a query to get a code from table A which is not in table B for same ID. I have hardcoded the ID in the query, I want to know how to get the desired output for all the IDs not for 539 alone. Below is the query

SELECT
    a.code
FROM
    A
WHERE
    a.code NOT IN(
        SELECT
            b.code
        FROM
            B b
        WHERE
           b.ID='539'
        AND b.status <> 'D')
AND 
     (a.id='539')
AND 
     (a.status <> 'D')

Answer 1

Join the tables together with a LEFT join and then only select records that do not have a corresponding record in table B

SELECT a.code
FROM A
LEFT JOIN B
  ON a.ID = b.ID
  AND a.code = b.code
  AND b.status <> 'D'
WHERE a.status <> 'D'
AND b.code IS NULL