Task: Text to Code
Input (English): Step 1: For each row in Apartments table, find the corresponding rows in Apartment_Facilities table.
Step 2: find the summation of bathroom_count in the results of step 1 whose facility_code equals Gym
Output (English): SELECT Sum ( T1.bathroom_count ) FROM Apartments AS T1 JOIN Apartment_Facilities AS T2 ON T1.apt_id = T2.apt_id WHERE T2.facility_code = "Gym"