计算列中的所有值

Question

我有一张表order_product

我想计算成本列和数量列WHERE order_orderNumber = 1100

中的所有值

我该怎么做。？

Answer 1

如果你的意思是总和，你可以这样做：

SELECT product_id, SUM(quantity) AS totalQuantity, SUM(cost) AS totalCost
FROM order_product WHERE order_orderNumber = 1100
GROUP BY product_id