Question: How many branches have the number of members in each branch registered after 2015? | Did you mean the number of branches which have some members registered after 2015? | Thanks!
SQL: select count ( * )  from  ( SELECT T2.name  FROM membership_register_branch AS T1 JOIN branch AS T2 ON T1.branch_id   =   T2.branch_id WHERE T1.register_year  >  2015 GROUP BY T2.branch_id )