Task: Text to Code
Input (English): Step 1: For each row in branch table, find the corresponding rows in membership_register_branch table.
Step 2: find the number of rows of each value of membership_register_branch's Branch_ID in the results of step 1.
Step 3: find Name, Open_year of step 1 results with largest value in the results of step 2
Output (English): SELECT T1.Name , T1.Open_year FROM branch AS T1 JOIN membership_register_branch AS T2 ON T1.Branch_ID = T2.Branch_ID GROUP BY T2.Branch_ID ORDER BY Count ( * ) Desc LIMIT 1