Leetcode Problem - 1336. Number of Transactions per Visit | SQL | Hard Question

Tackle a problem in banking data analysis. It aims to identify how many users visited the bank and performed a specific number of transactions during their visit.

SQL Schema
```Create table If Not Exists Visits (user_id int, visit_date date)
Create table If Not Exists Transactions (user_id int, transaction_date date, amount int)
Truncate table Visits
insert into Visits (user_id, visit_date) values ('1', '2020-01-01')
insert into Visits (user_id, visit_date) values ('2', '2020-01-02')
insert into Visits (user_id, visit_date) values ('12', '2020-01-01')
insert into Visits (user_id, visit_date) values ('19', '2020-01-03')
insert into Visits (user_id, visit_date) values ('1', '2020-01-02')
insert into Visits (user_id, visit_date) values ('2', '2020-01-03')
insert into Visits (user_id, visit_date) values ('1', '2020-01-04')
insert into Visits (user_id, visit_date) values ('7', '2020-01-11')
insert into Visits (user_id, visit_date) values ('9', '2020-01-25')
insert into Visits (user_id, visit_date) values ('8', '2020-01-28')
Truncate table Transactions
insert into Transactions (user_id, transaction_date, amount) values ('1', '2020-01-02', '120')
insert into Transactions (user_id, transaction_date, amount) values ('2', '2020-01-03', '22')
insert into Transactions (user_id, transaction_date, amount) values ('7', '2020-01-11', '232')
insert into Transactions (user_id, transaction_date, amount) values ('1', '2020-01-04', '7')
insert into Transactions (user_id, transaction_date, amount) values ('9', '2020-01-25', '33')
insert into Transactions (user_id, transaction_date, amount) values ('9', '2020-01-25', '66')
insert into Transactions (user_id, transaction_date, amount) values ('8', '2020-01-28', '1')
insert into Transactions (user_id, transaction_date, amount) values ('9', '2020-01-25', '99')
```

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