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Learn how to sort customer orders by `total price` in descending order using Oracle SQL, alongside formatting dates properly.
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How to Sort Customer Orders by Total Price in Oracle SQL

When working with Oracle SQL, there can be instances where you need to retrieve customer orders in a specific order. For example, you might want to list out the orders while sorting them by total price in descending order. Additionally, you may want to format date outputs to a specific style.

In this guide, we will tackle a common issue: sorting customer orders based on total price and formatting order dates.

The Problem

Suppose you are writing a SQL procedure to list the customer orders for the first 10 customers. Your requirement is to ensure that the output displays the total price of orders in descending order instead of sorting by order key.

Here is the center of the problem as explained:

The existing SQL query sorts the output by various fields but doesn't prioritize the total price.

Dates are formatted incorrectly, showing abbreviated years instead of full years.

The Solution

Let's break down the solution into manageable parts.

Step 1: Rearranging the SQL Query

To achieve the desired sorting, we will modify the SQL statement. Specifically, we will apply the DENSE_RANK() function to order by the total price in descending order.

Here’s the modified SQL code snippet:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Using Analytic Functions for Sorting (Optional)

If your database version is 12 or newer, you can simplify the query even further by directly incorporating the analytic function into the ORDER BY clause:

[[See Video to Reveal this Text or Code Snippet]]

This approach keeps your code concise and optimized for performance.

Step 3: Formatting Dates

To ensure the order dates display in your desired format (e.g., 01-Nov-1995 instead of 01-Nov-95), the TO_CHAR function handles the formatting in SQL, as shown in the examples above.

Conclusion

By applying these steps, you can effectively sort customer orders by total price in descending order while ensuring that dates are displayed correctly. This method not only assists in presenting data accurately but also enhances the readability of your SQL output.

Now that you understand how to tweak your SQL queries for better output, you can apply these techniques in your projects. Happy coding!