MySQL行成列数和总和

Question

有人可以帮忙我的SQL吗？

我有一个表，其中包含诸如：

ID | Car_num | Service | Price
---+---------+---------+------
1  | 001     | shower  | 10
2  | 002     | TV      |  5
3  | 001     | TV      |  5

如何编写SQL查询以获取以下输出？

ID |Car_num | shower | TV
---+--------+--------+---
1  | 001    | 10     | 5
2  | 002    |  0     | 5

Answer 1

使用数据透视查询：

SELECT MIN(ID) AS ID,
       Car_num,
       MAX(CASE WHEN Service = 'shower' THEN Price ELSE 0 END) AS shower,
       MAX(CASE WHEN Service = 'TV'     THEN Price ELSE 0 END) AS TV
FROM yourTable
GROUP BY Car_num

Answer 2

SELECT ROW_NUMBER() OVER(ORDER BY Car_num) Id,Car_num ,ISNULL([TV],0) [TV],ISNULL([shower],0) [shower]

FROM（SELECT Car_num，_Service，ISNULL（Price，0）价格FROM #Table）数据PIVOT（MAX（Price）FOR _Service IN（[TV]，[shower]））AS PVT

Answer 3

尝试这个：

SELECT ID, Car_num
   , SUM(IF(Service = 'shower', Price, 0)) AS Shower
   , SUM(IF(Service = 'TV', Price, 0)) AS TV
FROM your_table
GROUP BY Car_num;