Context: CREATE TABLE room (blockfloor VARCHAR, blockcode VARCHAR); CREATE TABLE BLOCK (blockfloor VARCHAR, blockcode VARCHAR)
Question: Find the number of rooms located on each block floor.
Answer: 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