SELECT MAX 与 WHERE 条件

Question

我正在尝试执行以下 sql 查询

SELECT MAX(amount) AS LargestPrice FROM au_bids WHERE product = 73

我不能这样做，因为 WHERE 条件不起作用，它给了我整个表中最大数字的值。

我做错了什么？

Answer 1

您的查询是正确的

SELECT MAX(amount) AS LargestPrice FROM au_bids WHERE product = 73

查看现场演示

http://sqlfiddle.com/#!9/11bbf1/2

Answer 2

您的查询是正确的

mysql> select * from Customers;
+-------------+---------------+
| customer_id | customer_name |
+-------------+---------------+
|           1 | Arun          |
|           2 | kumar         |
|           4 | bbbbb         |
|           5 | mmmmm         |
|           6 | kkkk          |
|           3 | eeeeee        |
+-------------+---------------+
6 rows in set (0.00 sec)

mysql> select max(customer_id) from Customers where customer_id=2;
+------------------+
| max(customer_id) |
+------------------+
|                2 |
+------------------+
1 row in set (0.00 sec)