How to sum in subquery in laravel?

@adan 

To sum in a subquery in Laravel, you can use the DB facade to write raw SQL queries within your Laravel application. Here's an example of how you can sum values in a subquery in Laravel:

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use IlluminateSupportFacadesDB;

$subquery = DB::table('orders')
            ->select(DB::raw('SUM(total_amount) as total_amount'))
            ->where('user_id', 1);

$totalAmount = DB::table(DB::raw("({$subquery->toSql()}) as sub"))
            ->mergeBindings($subquery)
            ->select('total_amount')
            ->first();

// Access the sum value
dd($totalAmount->total_amount);

In this example, we first create a subquery using the DB facade and calculate the sum of the total_amount column in the orders table where the user_id is 1. We then use this subquery to calculate the sum and retrieve the total amount value.

Remember to replace the table name (orders) and column names (total_amount, user_id) with your actual database table and column names in your application.