Upload 189

Author: ggeerraarrdd

README.md

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 [![eevveerryyddaayy release](https://img.shields.io/badge/eevveerryyddaayy-v1.3.0-blue.svg)](https://github.com/ggeerraarrdd/eevveerryyddaayy/)
-[![Solved](https://img.shields.io/badge/solved-188-green.svg)](#index)
+[![Solved](https://img.shields.io/badge/solved-189-green.svg)](#index)
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 # SQL Everyday
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 | 186   | [Sales Analysis II](https://leetcode.com/problems/sales-analysis-ii/description/)                                                                                 | [Solution](solutions/186_sales_analysis_ii.md)                                          | LeetCode    | Easy         | `STRING_AGG` vs `GROUP_CONCAT`                                      |
 | 187   | [Sales Analysis III](https://leetcode.com/problems/sales-analysis-iii/description/)                                                                               | [Solution](solutions/187_sales_analysis_iii.md)                                         | LeetCode    | Easy         | `HAVING`                                                            |
 | 188   | [The Winner University](https://leetcode.com/problems/the-winner-university/description/)                                                                         | [Solution](solutions/188_the_winner_university.md)                                      | LeetCode    | Easy         |                                                                     |
+| 189   | [Unique Orders and Customers Per Month](https://leetcode.com/problems/unique-orders-and-customers-per-month/description/)                                         | [Solution](solutions/189_unique_orders_and_customers_per_month.md)                      | LeetCode    | Easy         |                                                                     |
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solutions/189_unique_orders_and_customers_per_month.md

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+# SQL Everyday \#189
+
+## Unique Orders and Customers Per Month
+
+Site: LeetCode\
+Difficulty per Site: Easy
+
+## Problem
+
+Write a solution to find the number of **unique orders** and the number of **unique customers** with invoices **> $20** for each **different month**.
+
+Return the resulting table in **any order**. [[Full Description](https://leetcode.com/problems/unique-orders-and-customers-per-month/description/)]
+
+## Submitted Solution
+
+```sql
+-- Submitted Solution
+SELECT
+    TO_CHAR(order_date, 'YYYY-MM') AS month
+    ,COUNT(DISTINCT order_id) AS order_count
+    ,COUNT(DISTINCT customer_id) AS customer_count
+FROM Orders
+WHERE invoice > 20
+GROUP BY month
+;
+```
+
+## Site Solution
+
+```sql
+-- LeetCode Solution 
+-- None
+
+-- Code Author: Yasin
+-- https://leetcode.com/problems/unique-orders-and-customers-per-month/solutions/960078/mysql-solution
+-- (modified)
+SELECT
+    LEFT(order_date, 7) AS month 
+    ,COUNT(DISTINCT order_id) AS order_count
+    ,COUNT(DISTINCT customer_id) AS customer_count
+FROM Orders
+WHERE invoice > 20
+GROUP BY 1
+;
+```
+
+## Notes
+
+TBD
+
+## NB
+
+TBD
+
+Go to [Index](../?tab=readme-ov-file#index)\
+Go to [Overview](../?tab=readme-ov-file)