join 세번째 문제https://leetcode.com/problems/customer-who-visited-but-did-not-make-any-transactions/description/?envType=study-plan-v2&envId=top-sql-50⬆️ 문제 전문 링크는 여기 Table: Visits+-------------+---------+| Column Name | Type |+-------------+---------+| visit_id | int || customer_id | int |+-------------+---------+visit_id is the column with unique values for this table.This table cont..
