Case stmt for peewee
Funny you should ask that!  I've just been looking at making this easier to accomplish.  Currently you have to do some messy stuff with `Clause` and `R`.
 I hope you can do "magic" :)
 Something like sqlalchemy would be perfecet

case([
                   (CcnDef.w_pci.code,'PCI'),
                   (CcnDef.w_cath.code,'CATH'),
                 ],else_="None").label('PCI_OR_CATH')
 Usage is in the testcase, but it is pretty similar to the SQA example you pasted.  Let me know if you have any questions or trouble w/it
 Thx when I get chance I'll test it, but look good , as always :)

Hi , thx for peewee , can we do CASE() stmt with peewee?
