Laravel query builder - Union All with Skip and Take - php

Question

I need to get data from a table using this query:
(select columns
from tableX
join tableZ
on tableX.id1 = tableZ.other_id)
union all
(select columns
from tableX
join tableZ
on tableX.id2 = tableZ.other_id)
LIMIT num1, num2
Without the LIMIT, I get the correct result with my query builder that look like this (let $first be the first query of select and $second is the other select query):
$first->unionAll($second)->get();
When I try to put skip and/or take, the result is not the same as the first query above.
$first->unionAll($second)->take(num1)->skip(num2)->get();
The result query from the above builder (I got it from DB::getQueryLog()) is something like:
(select columns
from tableX
join tableZ
on tableX.id1 = tableZ.other_id LIMIT num1, num2)
union all
(select columns
from tableX
join tableZ
on tableX.id2 = tableZ.other_id)
which ofcourse yield incorrect result. Does anyone knows what is the work around to make the first query? Thanks!

Answer 1

You need to wrap $firstQuery in another query, like this:
$first->unionAll($second);
$rows = DB::table( DB::raw("({$first->toSql()}) as t") )
->mergeBindings($first->getQuery())
->take(num1)->skip(num2)
->get();
This will result in the following query:
select * from (FIRST_QUERY union all SECOND_QUERY) as t limit num1, num2

Answer 2

One Workaround is to use raw query using DB::select and DB::raw in below sample block...
$num1 = 100; // skip first 100 rows
$num2 = 2; // take only 2 rows
$qry_result = DB::select(DB::raw("select * from
(
(select columns from tableX join tableZ on tableX.id1 = tableZ.other_id)
union all
(select columns from tableX join tableZ on tableX.id2 = tableZ.other_id)
) Qry LIMIT :vskip , :vlimit ") , array('vskip'=>$num1,'vlimit'=>$num2)
);