mysql - Mysql 总价、总和和不同（产品）

Question

我有以下mysql表：

product_id   selling_price
10            200
10            200
11            100
11            100
13            300

我怎样才能返回类似下面的东西

product_id    total    total_selling_price
10            2        400
11            2        200
13            1        300

Answer 1

SELECT  product_ID,
        COUNT(*) totalCount,
        SUM(selling_price) total_selling_price
FROM    TableName
GROUP   BY product_ID

• SQLFiddle 演示
• GROUP BY（聚合）函数列表

输出

╔════════════╦════════════╦═════════════════════╗
║ PRODUCT_ID ║ TOTALCOUNT ║ TOTAL_SELLING_PRICE ║
╠════════════╬════════════╬═════════════════════╣
║         10 ║          2 ║                 400 ║
║         11 ║          2 ║                 200 ║
║         13 ║          1 ║                 300 ║
╚════════════╩════════════╩═════════════════════╝

Answer 2

你需要group by aggregate function with count and sum.

尝试这个。

select   product_id, count(product_id), sum(selling_price)
from     tablename
group by product_id;

Answer 3

试一试，未在本地测试

SELECT  product_id,
        COUNT(product_id),
        SUM(Amount)
FROM    yourTable
GROUP BY    product_id