task: #3220

Ivanbyone · Ivanbyone · commit 5924813b3a72 · 2025-07-17T22:30:44.000+03:00
diff --git a/README.md b/README.md
@@ -175,6 +175,7 @@ Useful for preparing for technical interviews and improving your SQL skills.
     - [1393. Capital Gain/Loss](./leetcode/medium/1393.%20Capital%20Gain&Loss.sql)
     - [1907. Count Salary Categories](./leetcode/medium/1907.%20Count%20Salary%20Categories.sql)
     - [1934. Confirmation Rate](./leetcode/medium/1934.%20Confirmation%20Rate.sql)
+    - [3220. Odd and Even Transactions](./leetcode/medium/3220.%20Odd%20and%20Even%20Transactions.sql)
     - [3475. DNA Pattern Recognition](./leetcode/medium/3475.%20DNA%20Pattern%20Recognition.sql)
     - [3497. Analyze Subscription Conversion](./leetcode/medium/3497.%20Analyze%20Subscription%20Conversion.sql)
 3. [Hard](./leetcode/hard/)
diff --git a/leetcode/medium/3220. Odd and Even Transactions.sql b/leetcode/medium/3220. Odd and Even Transactions.sql
@@ -0,0 +1,35 @@
+/*
+Question 3220. Odd and Even Transactions
+Link: https://leetcode.com/problems/odd-and-even-transactions/description/?envType=problem-list-v2&envId=database
+
+Table: transactions
+
++------------------+------+
+| Column Name      | Type | 
++------------------+------+
+| transaction_id   | int  |
+| amount           | int  |
+| transaction_date | date |
++------------------+------+
+The transactions_id column uniquely identifies each row in this table.
+Each row of this table contains the transaction id, amount and transaction date.
+Write a solution to find the sum of amounts for odd and even transactions for each day. If there are no odd or even transactions for a specific date, display as 0.
+
+Return the result table ordered by transaction_date in ascending order.
+*/
+
+SELECT
+    transaction_date,
+    SUM(CASE
+        WHEN amount % 2 = 1
+            THEN amount
+        ELSE 0
+    END) AS odd_sum,
+    SUM(CASE
+        WHEN amount % 2 = 0
+            THEN amount
+        ELSE 0
+    END) AS even_sum
+FROM transactions
+GROUP BY transaction_date
+ORDER BY transaction_date ASC
