Laravel 5.6查询生成器总和

Question

I have table 'peserta' with structure

• name (varchar)
• h1 (integer)
• h2 (integer)
• h3 (integer)

I want select (h1 + h2 + h3) as total and order by ascending with limit 30. what the right query builder?

> $rank['rank'] = DB::table('peserta')->select('*', '(n1+n2+n3) as
> total')->limit(30)->orderBy('total', 'asc')->get();

Answer 1

Use Raw query:

DB::table('peserta')
   ->select(
        '*', 
       DB::raw('(n1+n2+n3) as > total')
    )
   ->limit(30)
   ->orderBy('total', 'asc')
   ->get();

Answer 2

You can do this with eloquent selectRaw method.

$rank['rank'] = DB::table('peserta')
                ->selectRaw('*, h1 + h2 + h3 as total')
                ->limit(30)
                ->orderBy('total', 'asc')
                ->get();

Answer 3

DB::table('peserta')
 ->select('*', DB::raw('(IFNULL(h1,0) + IFNULL(h2,0)) + IFNULL(h3,0) as total'))
 ->orderBy('total')
 ->limit(30)
 ->get();

I am setting 0 if one of the column value is null otherwise total will be giving you null value if one of h1,h2 or h3 is null.