我正试图派生出一个能解决这个问题的MySQL查询:
product | sold
milk | 6
milk | 4
bread | 3
bread | 2
bread | 2
对此;
product | sold | total order | Total sold
milk | 2 | 2 | 6
milk | 4 | 2 | 6
bread | 3 | 3 | 7
bread | 2 | 3 | 7
bread | 2 | 3 | 7
我已经能够获得总和的查询,但没有问题,但是我似乎无法将它作为与产品匹配的新列加入。这有可能吗?我已经尝试过WITH ROLLUP
,但它只是创建了另一行,而不是我想要的。
答案 0 :(得分:1)
您可以将此表上的简单查询与汇总查询结合在一起:
SELECT a.product, a.sold, b.total_order, b.total_sold
FROM mytable a
JOIN (SELECT product, COUNT(*) AS total_order, SUM(sold) AS total_sold
FROM mytable
GROUP BY product) b ON a.product = b.product