如何在 laravel elequent 中加入子查询

Question

How do this query in laravel query builder?

select * from products p join 

(
select product_id,sum(qty) total_sales 

from orders where qty !=0 group by product_id
) 

s on p.id = s.product_id

order by s.total_sales desc

Answer 1

There are different ways are there to do the same thing. But you can do with Raw Expressions is very similar to your above code.

Answer 2

if you want to use Eloquent, Do this provided the orders table has product_id that is a foreign key from products

DB::table('products')->join('orders','products.id','orders.product_id')->where('orders.qty','!=',0)->get()

Answer 3

The first part for sub-query for join ed part. It is joined with toSql() method inside the raw statement.

$subQuery = DB::table('orders')
    ->where('qty', '!=', DB::raw(0))
    ->groupBy('product_id')
    ->select('product_id', DB::raw('sum(qty) as total_sales'));

return DB::table('products as p')
    ->join(DB::raw('(' . $subQuery->toSql() . ') s'), 'p.id', '=', 's.product_id')
    ->orderByDesc('s.total_sales')
    ->get();

It prints the following sql;

SELECT *
FROM `products` AS `p`
         INNER JOIN (
    SELECT `product_id`, SUM(qty) AS total_sales
    FROM `orders`
    WHERE `qty` != 0
    GROUP BY `product_id`
) s ON `p`.`id` = `s`.`product_id`
ORDER BY `s`.`total_sales` DESC