[leetcode][Database][Hard] 1336. Number of Transactions per Visit

Description Table: Visits +---------------+---------+ | Column Name | Type | +---------------+---------+ | user_id | int | | visit_date | date | +---------------+---------+ (user_id, visit_date) is the primary key for this table. Each row of this table indicates that user_id has visited the bank in visit_date. Table: Transactions +------------------+---------+ | Column Name | Type | +------------------+---------+ | user_id | int | | transaction_date | date | | amount | int | +------------------+...

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