leetcode question

Author: mdh266

README.md

@@ -17,6 +17,8 @@ These are scripts that answer questions from <a href="https://leetcode.com">leet
 |[Department Top Three Salaries](https://leetcode.com/problems/department-top-three-salaries/submissions/) | [Solution](https://github.com/mdh266/SQL-Practice/blob/master/leetcode/Top3DeptSalaries.sql) |
 |[N-th Highest Salary](https://leetcode.com/problems/nth-highest-salary/) | [Solution](https://github.com/mdh266/SQL-Practice/blob/master/leetcode/NthHighestSalary.sql)|
 |[Department Highest Salary](https://leetcode.com/problems/department-highest-salary/) | [Solution](https://github.com/mdh266/SQL-Practice/blob/master/leetcode/DeptHighestSalary.sql) |
+| [Monthly Transactions I](https://leetcode.com/problems/monthly-transactions-i/) | 
+[Solution](https://github.com/mdh266/SQL-Practice/blob/master/leetcode/monthly-transactions-i.sql) ||
 | [Rank Scores](https://leetcode.com/problems/rank-scores/) | [Solution](https://github.com/mdh266/SQL-Practice/blob/master/leetcode/RankScores.sql) |
 | [Not Boring Movies](https://leetcode.com/problems/not-boring-movies/) | [Solution](https://github.com/mdh266/SQL-Practice/blob/master/leetcode/notboringmovies.sql)|
 | [Exchange Seats](https://leetcode.com/problems/exchange-seats/) | [Solution](https://github.com/mdh266/SQL-Practice/blob/master/leetcode/exchange-seats.sql)|

leetcode/monthly-transactions-i.sql

@@ -0,0 +1,11 @@
+SELECT
+    CAST(trans_date AS CHAR(7)) AS month,
+    country,
+    COUNT(1) AS trans_count,
+    SUM(CASE WHEN state = 'approved' THEN 1 ELSE 0 END) approved_count,
+    SUM(amount) AS trans_total_amount,
+    SUM(CASE WHEN state = 'approved' THEN amount ELSE 0 END) approved_total_amount
+FROM 
+    Transactions
+GROUP BY 1,2
+;