How to do sum of sum in mysql query

Question

SELECT a.id AS supplier, sum( processed_weight ) AS total_qty
FROM supplier_inward a
INNER JOIN warehouseb ON a.id = b.supplier
WHERE a.master_product_id = '38'
GROUP BY b.supplier

output present

supplier    total_qty
12046      475.00
12482      99.00

output needed

total_qty
574.00

here i need the sum(total_qty) in this query? how to achieve this

Answer 1

how about this:

SELECT SUM(iQuery.total_qty) as iTotal
FROM
    (SELECT a.id AS supplier, sum( processed_weight ) AS total_qty
    FROM supplier_inward a
    INNER JOIN warehouseb ON a.id = b.supplier
    WHERE a.master_product_id = '38'
    GROUP BY b.supplier) as iQuery