drnx3715 2017-07-29 03:12
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如何在数据库中获取多列的Mysql SUM

I want to calculate total products in cart for one user by summing values for each product in cart.

I'm using this query :

    SELECT *, SUM(quantity) OVER (PARTITION BY product_id ORDER BY id) AS TotalProducts 
    FROM cart WHERE user_id ='$user_id';

Getting error:

SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '(PARTITION BY product_id ORDER BY id)

EDIT with DB schema

id | product_id | quantity | user_id
1  | 37         | 2        | 23847
2  | 70         | 2        | 23847

I can't see what I'm doing wrong?

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2条回答 默认 最新

  • dongtang5776 2017-07-29 03:36
    关注

    I'm not familiar with the MariaDB syntax, and you didn't show your schema, but here's my shot at an answer:

    SELECT c.*,
        SUM(c.quantity) as `TotalProducts`
    FROM cart c
    WHERE c.user_id = '$user_id'
    GROUP BY c.user_id
    

    Or, if you want a total per product, you could use:

    SELECT c.*,
        SUM(c.quantity) as `TotalProducts`
    FROM cart c
    WHERE c.user_id = '$user_id'
    GROUP BY c.user_id, c.product_id
    
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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