Task: Text to Code
Input (English): Step 1: For each row in Addresses table, find the corresponding rows in Clients table.
Step 2: find the number of rows of each value of Clients's Address_ID in the results of step 1.
Step 3: find City_Town in the results of step 1 whose corresponding value in step 2 is less than or equals 1
Output (English): SELECT T1.City_Town FROM Addresses AS T1 JOIN Clients AS T2 ON T1.Address_ID = T2.Address_ID GROUP BY T2.Address_ID HAVING Count ( * ) < = 1