如何从MySQL中的两列中查找范围

Question

I have a value say 45.

I want to check whether this value is present in database or not.

The problem is that I have two columns, say:

--------------------
range_from  range_to
--------------------
   10 ------------ 20
--------------------
   21 ------------ 30
--------------------
   31 ------------ 40
--------------------
   41 ------------ 50
--------------------

How can I find this value?

SELECT * FROM Score WHERE range_from='' AND range_to=''

Answer 1

SELECT *
FROM score
WHERE range_from < 45 AND range_to > 45;

Answer 2

Normally you would use the keyword 'BETWEEN'

SELECT * FROM score 
WHERE 45 BETWEEN range_from AND range_to

Answer 3

To take care of boundary conditions also we can consider small correction in the above answer

SELECT *
FROM score
WHERE range_from <= 50 AND range_to >= 50;