CREATE TABLE branch (branch_id DECIMAL, name TEXT, open_year TEXT, address_road TEXT, city TEXT, membership_amount TEXT)
CREATE TABLE member (member_id DECIMAL, card_number TEXT, name TEXT, hometown TEXT, level DECIMAL)
CREATE TABLE purchase (member_id DECIMAL, branch_id TEXT, year TEXT, total_pounds DECIMAL)
CREATE TABLE membership_register_branch (member_id DECIMAL, branch_id TEXT, register_year TEXT)

What are names for top three branches with most number of membership?
SELECT name FROM branch ORDER BY membership_amount DESC LIMIT 3
SELECT "name" FROM "branch" ORDER BY "membership_amount" DESC NULLS LAST LIMIT 3