Question

我有一个包含currency_code和price的mysql表。

currency_code | price

usd | 50

twd | 1570

JPY | 5049

用户可以输入一系列price来搜索产品：

SELECT * FROM product WHERE price between 0 and 1500

如果表格中的currency_code不同，我该如何进行price范围查询？

Answer 1

您必须控制所选币种并将其放入查询中：

SELECT * FROM product WHERE price between 0 and 1500
AND currency_code = $selected_currency_code

Answer 2

从您的问题中我了解到我们有两个如下表格为便于理解请查看这些示例

价

id  |currency_id    |price
----------------------------
1   |1              |1000
2   |2              |1500
3   |1              |1300

货币

currency_id |   currency_name
--------------------------------
1           |   Dollor
2           |   Euro

这是一个示例连接查询，可以输出0到1500之间的值

 SELECT price.id,price.price,currency_code.currency_name FROM price 
INNER JOIN currency_code ON price.currency_id = currency_code.currency_id 
WHERE price  BETWEEN 0 AND 1500

Answer 3

select driver.*,
case
when driver.rental_currency = 'HKD' then driver_rental.HKT_1_fee_full_day / 7.78
when driver.rental_currency = 'TWD' then driver_rental.HKT_1_fee_full_day / 31.4
when driver.rental_currency = 'CNY' then driver_rental.HKT_1_fee_full_day / 6.67
end
as HKT_1_fee_full_day
from driver_rental
left join driver
on
driver.email = driver_rental.email
where
driver_rental.HKT_1_fee_full_day between 0 and 52
;

使用case之后where语句不起作用？

选择多种货币的价格范围

3 个答案: