Joining Lookups - capitals & small letters

Hi,

Find below a sample data from the lookup table

CODE     DESC
SCE - SalesCallElectric
SCe - SalesCallTech - Electric
SCF - SalesCallFluidPower
SCf - SalesCallTech - FluidPower

And then the main table [SalesCall] has got reference to these lookup values. What should I use while joining the [SalesCall] and [Lookup] table on [CODE] column which picks the right [Desc] value i.e. it can identify the difference between lookup codes ending with capitals and those ending with small alphabets ? At present its getting confused between small & capital alphabtes...

Hopefully my question makes sense :)

Thanks in advance !!