从 mysql 值中删除单词答案

【问题标题】：Strip word from mysql value从 mysql 值中删除单词
【发布时间】：2020-07-02 10:59:29
【问题描述】：

希望运行选择查询以按尺寸过滤产品，但 Product_Size 列在数字后有字符，例如“英寸”。我尝试了以下方法，但没有返回任何结果。

SELECT * FROM `products` where Product_size BETWEEN '2 inches' AND '4.9 inches'

如何从查询中去掉“英寸”这个词？

【问题讨论】：

Product_size列的数据类型是什么？
@forpas - varchar(255)
字符串之间的任何比较总是按字母顺序进行。发布示例数据。

标签： php mysql select

【解决方案1】：

您可以使用replace()

  SELECT * FROM products 
  where Category_List =1 and Category_List_2=7 and 
  Designed_For_Who LIKE '%%' and (RRP between '0' and '100000') and 
  Product_size BETWEEN cast(replace('2 inches',' inches','') as int) AND 
  cast(replace('4.9 inches',' inches','') as int) 
  ORDER BY Name ASC

【讨论】：

谢谢，但是当我将其添加到我的查询中（如下）时，我得到了一个错误？ `SELECT * FROM products where Category_List =1 and Category_List_2=7 and created_For_Who LIKE '%%' and (RRP between '0' and '100000') and Product_size BETWEEN cast(replace('2 inches',' inches','' ) as int) AND cast(replace('4.9 inches','inches','') as int ORDER BY Name ASC
您的 SQL 语法有错误；查看与您的 MariaDB 服务器版本相对应的手册，了解在“ORDER BY Name ASC LIMIT 0, 25”附近使用的正确语法
@Designer，您错过了一个括号 - SELECT * FROM products where Category_List =1 and Category_List_2=7 and created_For_Who LIKE '%%' and (RRP between '0' and '100000') and Product_size BETWEEN cast(replace('2 英寸','inches','') as int) AND cast(replace('4.9 inches','inches','') as int) ORDER BY Name ASC

【解决方案2】：

您必须将字符串转换为数值。
对于您的情况，可以通过添加 0 隐式完成此转换：

SELECT * 
FROM `products` 
WHERE 
  Product_size LIKE '%inches'
  AND
  Product_size + 0 BETWEEN '2 inches' + 0 AND '4.9 inches' + 0

查看简化的demo。

【讨论】：