SELECT nurse FROM on_call WHERE blockfloor  =  1 AND blockcode  =  1
What nurses are on call with block floor 1 and block code 1? Tell me their names.
SELECT nurse FROM on_call WHERE blockfloor = 1 AND blockcode = 1
select nurse from on_call where blockfloor = value and blockcode = value
What nurses are on call with block floor 1 and block code 1 ? Tell me their names .