between A and B, 不能得到 A和B,如何才能取到 A,B在内的所有符合的值

between A and B, 不能得到 A和B,怎么才能取到 A,B在内的所有符合的值？
帮忙

[解决办法]
> =a and <=b
[解决办法]
> =a and <=b

[解决办法]
> =a and <=b