Question

My table payment_status have these fields:

• id
• payment_id
• status
• created
• created_by

Many entries could have the same payment_id… So, I want to get the last status for one payment_id…

I have this request that work but take too much time to load… I would like to have an optimize version to group by payment_id and take the last status.

SELECT pstatus.*
FROM `payment_status` AS pstatus
WHERE pstatus.id = (
   SELECT id
   FROM `payment_status`
   WHERE pstatus.status = '200'
   ORDER BY created DESC
   LIMIT 1
)
GROUP BY pstatus.payment_id
ORDER BY pstatus.payment_id DESC

Answer 1

Try this query –

SELECT t1.* FROM payment_status t1
  JOIN (SELECT payment_id, MAX(created) max_created
        FROM payment_status
        GROUP BY payment_id
        ) t2
    ON t1.payment_id = t2.payment_id AND t1.created = t2.max_created;

…then add WHERE conditions you need.