Including values NOT FOUND in MySQL query results

Question

I have the following MySQL tables:

tbl_pet_owners:

+----+--------+----------+--------+--------------+
| id | name   | pet      | city   | date_adopted |
         


        

Answer 1

Does MySQL STILL not have CTEs? They make life so much easier.

Regardless, to get 'NOT FOUND', use coalesce() in your SELECT.

SELECT DISTINCT p.petType
    , coalesce(po.name,'NOT FOUND') AS name
    , coalesce(po.city,'NOT FOUND') AS city
FROM (
    SELECT 'mammal' AS petType UNION ALL
    SELECT 'fish' UNION ALL
    SELECT 'amphibian' UNION ALL
    SELECT 'seacreature'
) p
LEFT OUTER JOIN (  
    SELECT tpo.name, tpo.city, pt.type AS petType
    FROM tbl_pet_owners tpo
    LEFT OUTER JOIN tbl_pet_types tpt ON tpo.pet = tpt.pet
) po ON p.petType = po.petType

I don't have a MySQL machine to test this on, but something like this should give you what you're looking for.