Yii2获得一列的总和

Question

我有两张桌子：

1. warehouse ['id','warehouse_name']和
2. products ['id','product_name','qty','warehouse_id']

通过warehouse_id连接。







我需要groupBy product_name和sum列qty和仓库 例如：

Product 2 14 WH1,WH2

Answer 1

查看您的示例输出数据，我认为您正在寻找SUM和GROUP_CONCAT

SELECT p.product_name,
       sum(p.qty) AS qty,
       GROUP_CONCAT(w.warehouse_name
                    ORDER BY w.warehouse_name ASC SEPARATOR ',') AS warehouse
FROM product p
INNER JOIN warehouse w ON p.warehouse_id = w.id
GROUP BY p.product_name;

<强>结果：

product_name    qty     warehouse
------------    ---     ---------
product 2        14     WH1,WH2
product 3        2      WH1
product 5        4      WH3

<强> DEMO