난이도: EASY 문제 링크: https://leetcode.com/problems/customer-who-visited-but-did-not-make-any-transactions/submissions/1539880821/?envType=study-plan-v2&envId=top-sql-50문제더보기Table: Visits +-------------+---------+ | Column Name | Type | +-------------+---------+ | visit_id | int | | customer_id | int | +-------------+---------+ visit_id is the column with unique values for this table. T..
