alternative for outer apply - mysql

Question

This is my tables
create table #vehicles (vehicle_id int, sVehicleName varchar(50))
create table #location_history ( vehicle_id int, location varchar(50), date datetime)
insert into #vehicles values
(1, 'MH 14 aa 1111'),
(2,'MH 12 bb 2222'),
(3,'MH 13 cc 3333'),
(4,'MH 42 dd 4444')
insert into #location_history values
( 1, 'aaa', getdate()),
( 1, 'bbb' , getdate()),
( 2, 'ccc', getdate()),
( 2, 'ddd', getdate()),
(3, 'eee', getdate()),
( 3, 'fff', getdate()),
( 4, 'ggg', getdate()),
( 4 ,'hhh', getdate())
This is query which I execute in SQL server.
select v.sVehicleName as VehicleNo, ll.Location
from #vehicles v outer APPLY
(select top 1 Location from #location_history where vehicle_id = v.vehicle_id
) ll
This is output in SQL server.
VehicleNO|Location
MH14aa1111 | aaa
MH12bb2222 | ccc
MH13cc3333 | eee
MH42dd4444 |ggg
I want to execute this in MySQL. and I want same output mentioned above.

Answer 1

First, the SQL Server query doesn't actually make sense, because you are using top without an order by.
Presumably, you intend something like this:
select v.sVehicleName as VehicleNo, ll.Location
from #vehicles v outer APPLY
(select top 1 Location
from #location_history
where vehicle_id = v.vehicle_id
order by ?? -- something to indicate ordering
) ll;
You need a method to get the latest record for each vehicle. Under normal circumstances, I think date would contain this information -- however, this is not true in your sample data.
Assuming that date really does contain unique values, then you can do:
select v.sVehicleName as VehicleNo, ll.Location
from vehicles v join
location_history lh
using (vehicle_id)
where lh.date = (select max(lh2.date)
from location_history lh2
where lh2.vehicle_id = lh.vehicle_id
);
Otherwise, you can do what you want using a correlated subquery. However, this will return an arbitrary matching value on the most recent date:
select v.sVehicleName as VehicleNo,
(select ll.Location
from location_history lh2
where lh2.vehicle_id = lh.vehicle_id
order by date desc
limit 1
) as location
from vehicles v ;