Question

如何通过查询获得这些结果：

Id --- Brand --- Price
1 -----Hp -------100
2 -----Hp -------200
3 -----Hp -------300
4 -----Acer -------100
5 -----Acer -------120

进入这些：

Id --- Brand --- Total Price
1 -----Hp -------600
2 -----Hp -------600
3 -----Hp -------600
4 -----Acer -------220
5 -----Acer -------220

品牌和ID必须如此显示。

Answer 1

你可以试试这个

SELECT
Id
,Brand
,(SELECT SUM(Price) FROM yourtable tb2 WHERE tb1.Brand = tb2.Brand) as TotalPrice
FROM yourtable tb1

Answer 2

您也可以使用JOIN获得所需的结果

步骤1-首先尝试使用以下查询获取所需值的SUM

SELECT id, brand, SUM( price ) AS price
FROM  `items` group by brand

输出

id  brand   price
4   Acer    220
1   HP      600

步骤2-现在对基表应用LEFT join以获得最终结果

SELECT t1.id, t1.brand, t2.price
FROM  `items` t1
LEFT JOIN (
SELECT id, brand, SUM( price ) AS price
FROM  `items` 
GROUP BY brand
)t2 ON t1.brand = t2.brand

输出

id  brand   price
1   HP      600
2   HP      600
3   HP      600
4   Acer    220
5   Acer    220

sql查询获取总值

2 个答案: