Querys with >= and <=

[eluser]Unknown[/eluser]
I'm trying to do querys with> = and <=, can someone provide an example?

[eluser]srpurdy[/eluser]
[quote author="huguitow" date="1345647589"]I'm trying to do querys with> = and <=, can someone provide an example?[/quote]

Code:

->where('fieldname.id >', $variable)

->where('fieldname.id <', $variable)