SQL inner join with max function by groub - mysql

Question

I have some problem from using the inner join with group by using max function.
my detail :
Table inventory
site_ID tank_number volume times-tramp ID
1 1 5000 06/08/2017 15:00 1
1 1 4900 06/08/2017 15:01 2
1 2 6000 06/08/2017 15:05 3
1 3 4000 06/08/2017 15:05 4
2 1 3000 06/08/2017 15:33 5
2 2 2000 06/08/2017 15:34 6
1 1 4800 06/08/2017 15:36 7
1 2 5800 06/08/2017 16:00 8
Table wp_users (wordpress)
ID Name
1 aaa
2 bbbb
Now, I using with wpdatatable plugin in wordpress so i want use the inner join and group with tank_number and using data update by times-strap
The result should be is :
When user "aaa" login then ID will is 1
the result that want to show.
site_ID tank_number volume times-tramp
1 1 4800 06/08/2017 15:36
1 2 5800 06/08/2017 16:00
1 3 4000 06/08/2017 15:05
But
I got the this result :
site_ID tank_number volume times-tramp
1 1 5000 06/08/2017 15:00
1 2 6000 06/08/2017 15:05
1 3 4000 06/08/2017 15:05
So can every one help to advise me so I have show my code the showing the error due to i can't join with 2 table by correct syntax sql.
this code can work without inner join
select site_id, tank_product, volume, timestramp from inventory as t1
inner join (
select tank_product as tank, max(timestramp) as time from inventory
where site_id=1 group by tank_product) as t2
on t1.tank_product = t2.tank and t1.timestramp = t2.time and t1.site_id=1
and Now I trying to using with inner join but not work now.
SELECT inventory.site_id,
inventory.tank_product,
inventory.volume,
inventory.timestramp,
wp_users.ID
FROM inventory as t1
INNER JOIN wp_users
(SELECT inventory.tank_product, max(inventory.timestramp) as time from inventory
WHERE inventory.site_id=wp_users.ID GROUP BY inventory.tank_product) as t2
ON t1.inventory.tank_product=t2.tank AND t1.inventory.timestramp=t2.time AND t1.inventory.site_id=wp_users.ID
Can advise me for correct way to use the inner join by group by max function.

Answer 1

So, the schema you present and the queries you provided don't line up (naming is all over the place). It would be very helpful if you provided a sql fiddle to help present your problem (at least in the future).
In any event, I think you were close:
select t2.site_id, t2.tank_product, t1.volume, t2.time
from (
select site_id, tank_product, max(timestramp) as time
from inventory
group by site_id,tank_product) t2
inner join inventory t1
on t2.site_id=t1.site_id and t1.tank_product=t2.tank_product and t2.time=t1.timestramp
inner join wp_users u
on u.id=t2.site_id
where u.id=1
order by t2.site_id,t2.tank_product asc
(Assuming you pass the wp_users.id into the query; I've hard-coded that with u.id=1.)
fiddle

Answer 2

Try to run this:
SELECT i1.site_ID, i1.tank_product, i1.volume, i.timestramp, iu.User_ID
FROM Inventory AS i1
INNER JOIN (
SELECT u.ID AS UserID, i.tank_product, MAX (i.timestramp) AS time
FROM Inventory AS i2
INNER JOIN wp_users AS u
ON i2.site_id = u.ID
GROUP BY u.ID, i.tank_product
) as iu
ON i1.tank_product = iu.tank_product
AND i1.timestramp = iu.time
AND i1.site_ID = iu.UserID;