Her skal du have en underforespørgsel, som får den seneste date_add
for hver id_order
i tabellen ps_order_history
. Resultatet af underforespørgslen føjes derefter tilbage til den oprindelige tabel ps_order_history
forudsat at den består af to kolonner:date_add
og id_order
.
SELECT c.firstname,
c.lastname,
d.product_name,
o.payment,
s.name,
h.date_add
FROM ps_orders o
INNER JOIN ps_order_detail d ON d.id_order = o.id_order
INNER JOIN ps_customer c ON c.id_customer = o.id_customer
INNER JOIN ps_order_history h ON o.id_order = h.id_order
INNER JOIN
(
SELECT id_order, MAX(date_add) max_date
FROM ps_order_history
GROUP BY id_order
) x ON h.id_order = x.id_order AND
h.date_add = x.max_date
INNER JOIN ps_order_state_lang s ON s.id_order_state = h.id_order_state
WHERE s.id_lang =6
GROUP BY c.id_customer