MySQL Query to Find First and Last Sale Date for Each Customer
Find the First and Last Sale Date for Each Customer
Write a MySQL query to find the first and last sale date for each customer using a window function.
Solution:
Explanation:
- Purpose of the Query:
- The goal is to find the first and last sale date for each customer.
- This demonstrates the use of the FIRST_VALUE() and LAST_VALUE() window functions.
- Key Components:
- FIRST_VALUE(SaleDate) OVER (PARTITION BY CustomerID ORDER BY SaleDate): Retrieves the first sale date for each customer.
- LAST_VALUE(SaleDate) OVER (PARTITION BY CustomerID ORDER BY SaleDate ROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING): Retrieves the last sale date for each customer.
- Why use Window Functions?:
- Window functions allow you to access the first and last values in a partition, making it easier to analyze the range of data for each group.
- Real-World Application:
- For example, in a retail business, you might want to analyze the purchasing behavior of customers by identifying their first and last purchase dates.
For more Practice: Solve these Related Problems:
- Write a MySQL query to find customers who made their first purchase within the last year.
- Write a MySQL query to identify customers whose last purchase was over 6 months ago.
- Write a MySQL query to calculate the number of days between a customer's first and last purchase.
- Write a MySQL query to find customers who made their first and last purchase in the same month.
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Previous MySQL Exercise: Calculate the Difference between Each Employee's Salary and the Department Average.
Next MySQL Exercise: Calculate the Percentage of Total Sales for each Product.
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