laravel query builder SUM code example

Example 1: select sum in laravel

Sometime for such queries you need to disable the strict check
 So inside config/database.php and inside mysql, 
 Set 'strict' => false,

->select('user_id', DB::raw('SUM(points) as total_points'))

Example 2: laravel query builder sum

$purchases = DB::table('transactions')
    ->join('categories', 'transactions.category_id', '=', 'categories.id')
    ->where('categories.kind', '=', 1)
    ->sum('transactions.amount');