Laravel将多个SQL选择为AS

Question

I'm trying to select multiple database columns and to merge them to an AS value statement like SELECT sum1 as vsd FROM tablename WHERE year = 2017

I have multiple columns I need to output as one value. So I imagine the above code looking something like this:

SELECT (sum1, sum2) as vsd FROM tablename WHERE year = 2017

My current live-code query looks like this:

$query = DB::table('exports')->select('id', 'year', 'week', 'month', 'staff_a, staff_b as vsd')->having('year','=',$year)->where('week', '<=', $weeknr)->orderBy('id', 'desc')->take(14)->get()->reverse();

The result is:

Column not found: 1054 Unknown column 'staff_a, staff_b' in 'field list'

I tried to combine them (columns) to an array ( array('staff_a', 'staff_b') ), had some weird foreach-loops and whatnot trying to make it work another way but all that threw yet another error message.

Is there any way to "merge" multiple selects to one?

Answer 1

You have to use RAW syntax:

->select(DB::raw('staff_a + staff_b as vsd'))

Ref: https://laravel.com/docs/5.5/queries#raw-expressions