SELECT count(*) ,  T1.blockfloor FROM BLOCK AS T1 JOIN room AS T2 ON T1.blockfloor  =  T2.blockfloor AND T1.blockcode  =  T2.blockcode GROUP BY T1.blockfloor
How many rooms does each block floor have?
SELECT count ( * ) , T1.blockfloor FROM BLOCK AS T1 JOIN room AS T2 ON T1.blockfloor = T2.blockfloor AND T1.blockcode = T2.blockcode GROUP BY T1.blockfloor
select count ( * ) , t1 . blockfloor from block as t1 join room as t2 on t1 . blockfloor = t2 . blockfloor and t1 . blockcode = t2 . blockcode group by t1 . blockfloor
How many rooms does each block floor have ?