This Leetcode problem Monthly Transactions I LeetCode Solution is done in SQL.

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Monthly Transactions I LeetCode Solution

Problem Statement

id is the primary key of this table. The table has information about incoming transactions. The state column is an enum of type [“approved”, “declined”].

Write an SQL query to find for each month and country, the number of transactions and their total amount, the number of approved transactions and their total amount.

Return the result table in any order.

The query result format is in the following example.

Example 1:
Input:

Output:

Monthly Transactions I LeetCode Solution MySQL

select 
  date_format(trans_date, '%Y-%m') as month, 
  country, 
  count(*) as trans_count, 
  sum(
    if(state = 'approved', 1, 0)
  ) as approved_count, 
  sum(amount) as trans_total_amount, 
  sum(
    if(state = 'approved', amount, 0)
  ) as approved_total_amount 
from 
  Transactions 
group by 
  date_format(trans_date, '%Y-%m'), 
  country;Code language: SQL (Structured Query Language) (sql)