MySQL Group_Concat將兩個表放在一起

Question

我正嘗試將我的數據按我在x天之內記錄的所有價格進行分組。 我在使用SQL語句時遇到問題，這是我當前的語句

SELECT *, GROUP_CONCAT(Price) AS Prices FROM product_prices GROUP BY Product,Day

這是我的product_prices表；

+---------+--------------+
| Product | Day | Price  |
+---------+--------------+
|    Phone| 1   |  100   |
|  Speaker| 1   |  50    |
|   Phone | 2   |  230   |
|  Speaker| 2   |  80    |
+---------+--------------+

我想要這樣的價格在一天中將價格分組在一張桌子中

+---------+----------+
| Product | Prices   |
+---------+----------+
|    Phone| 100, 230 |
|  Speaker| 50, 80   | 
+---------+----------+

Answer 1

您必須在GROUP BY子句中刪除Day 。 此外，將*替換為Product ：

SELECT
  Product, 
  GROUP_CONCAT(Price) AS Prices 
FROM product_prices 
GROUP BY Product

在線演示

Answer 2

如果要從最低到最高選擇價格，則應在group_concat語句中使用order by ：

SELECT Product, 
GROUP_CONCAT(Price ORDER BY Price) AS Prices 
FROM product_prices 
GROUP BY Product

SQLFiddle