Question

我想知道如何进行查询以获取不同代码的总数以获得以下结果：

Table1
+---------+---------+---------+
|   ID    |  CODE   |  PRICE  |
+---------+---------+---------+
|    1    | PN5301  |    15   |
|    2    | PN5301  |    15   |
|    3    | PN5732  |    20   |
|    4    | PN4193  |    10   |
|    5    | PN5732  |    20   |
|    6    | PN5301  |    15   |
|    7    | PN5852  |    5    |
|    8    | PN4193  |    10   |
|    9    | PN4193  |    10   |
+---------+---------+---------+
Result
+-----------+
|   Total   |
+-----------+
|    50     |
+-----------+

我知道这个问题应该已经解决，但我不知道如何搜索。

Answer 1

假设您希望SUM MIN每CODE的价格，您可以使用以下查询：

SELECT SUM(PRICE) AS TOTAL_PRICE
FROM (
  SELECT MIN(PRICE) AS PRICE
  FROM mytable
  GROUP BY CODE) AS t

Demo here

Answer 2

首先，你应该指出你想要总和的东西。

假设您想要总价：

select sum(PRICE) FROM Table1

要对不同代码的值求和：

SELECT SUM(T1.PRICE) AS TOTAL
FROM (SELECT PRICE FROM Table1
GROUP BY CODE) as T1

Answer 3

您希望获得不同代码的总数

SELECT SUM(VAL) FROM (SELECT MAX(PRICE) AS VAL FROM TABLE GROUP BY CODE) T;

我怎么能做这个mysql查询

3 个答案: