对负数使用 Between 运算符

Question

为什么使用 between 运算符对正数有效，而对负数却不行？

select case when 1.25 between 1 and 2 then 'Works'else 'no' end --- returns WORKS

select case when -1.25 between -1 and -2 then 'works' else 'no' end -- Returns NO

Answer 1

select case when -1.25 between -2 and -1 then 'works' else 'no' end -- Returns works

Answer 2

试试下面的方法：您需要与 1.0 或 2.0 之类的浮点值进行比较，并且范围应该按正确的顺序进行比较，最小值将首先出现，然后是最大值，例如 -2.0 首先是最小值，然后是 -1.0

select case when 1.25 between 1.0 and 2.0 then 'Works' else 'no' end 

select case when -1.25 between -2.0 and -1.0 then 'works' else 'no' end

Answer 3

负值从 -2 增长到 -1。当然，BETWEEN中的test_expression、begin_expression、end_expression的数据类型必须相同。

所以你必须使用这个：

select case when 1.25 between 1.0 and 2.0 then 'Works' else 'no' end -- returns WORKS
select case when -1.25 between -2.0 and -1.0 then 'works' else 'no' end -- Returns WORKS

对负数使用 Between 运算符

Using the Between Operator for negative numbers

sql

sql-server

tsqlt