SubQueries in Laravel 4.2 - mysql

Question

Can anyone teach me how can we use a query like this in Laravel 4.2
SELECT
t.Truck_Number,
t.Created_dt,
t.Latitude,
t.Longitude,
t.Speed,
t.Heading
FROM
truckgps t
INNER JOIN
(
SELECT
Truck_Number,
max(Created_dt) as MaxDate
FROM
truckgps
GROUP BY
Truck_Number
) tm
ON
t.Truck_Number = tm.Truck_Number AND
t.Created_dt = tm.MaxDate
this query is provided by someone else, can it be made better using laravel ?

Answer 1

Using Laravel Query builder - you can make like this :
$results = DB::select("SELECT
t.Truck_Number,
t.Created_dt,
t.Latitude,
t.Longitude,
t.Speed,
t.Heading FROM truckgps t
INNER JOIN
( SELECT Truck_Number, max(Created_dt) as MaxDate from truckgps group by Truck_Number )
tm on t.Truck_Number = tm.Truck_Number and t.Created_dt = tm.MaxDate");
or if you have parameters, than you can binding like this :
DB::select("select count(1) count from table t where t.id= ? and t.roles_id = ?",
array($id, $role_id)
);

Answer 2

If you have two tables...I have one solution for your question.. you dont need use joins for this. Table1 name 'truckgps' and table 2 name 'truckgpss' My Ans
$truckgps = DB::table('truckgps')->select('Truck_Number','Created','Latitude','Longitude','Speed','Heading ')->get();
foreach ($truckgps as $t)
{
$result = DB::table('truckgpss')->select('MAX(Created_dt) AS MaxDate ','Truck_Number')->where('MaxDate','=',$t->Created_dt )->where('Truck_Number','=',$t->Truck_Number)->groupBy('Truck_Number')
->get();
// if u need value convert array to string use another foreach loop here
foreach ($result as $value)
{
echo $value->Truck_Number; // now u can see the result truck no..
}
}
I think its help to u...Thank you ..