Скачать или смотреть How to Use FIND_IN_SET to Sort Products by Match Count in MySQL

Learn how to efficiently sort products by the number of category matches using MySQL's `FIND_IN_SET` function. Enhance your database querying skills with this step-by-step guide.
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This video is based on the question https://stackoverflow.com/q/62936516/ asked by the user 'Elijah' ( https://stackoverflow.com/u/13466779/ ) and on the answer https://stackoverflow.com/a/62936678/ provided by the user 'Harshil Doshi' ( https://stackoverflow.com/u/2225030/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding the Problem: Sorting Products by Match Count

When dealing with product sorting in a database, it is not uncommon to want to display items based on how many categories they belong to. For instance, you might have an array of selected categories and wish to see products sorted by how many of these categories they match. In this guide, we’ll break down a MySQL query using the FIND_IN_SET function to not only fetch products but also sort them based on the number of matches they have with the selected categories.

The Initial Query Explained

Suppose you have a database of products and categories structured as follows:

Products:

APPLE (FRUIT, GREEN, ROUND)

WHEEL (MACHINES, BLACK, ROUND)

BANANA (FRUIT, YELLOW, CUBOID)

PHONE (ELECTRONICS, BLACK, CUBOID)

The original query you created might look something like this:

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

Here, you are fetching products based on selected categories and certain price ranges. However, the challenge arises when you want to sort them by the number of category matches.

The Solution: Modifying Your Query

To achieve the sorting based on category matches, you simply need to adjust the ORDER BY clause in your SQL query. Here’s how you can do it:

Updated SQL Query

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

Breakdown of Changes

ORDER BY clause:

You changed the sorting to ORDER BY count(C.category_name) DESC. This modification allows the query to sort the products based on the count of category matches in descending order, meaning that products with the highest match counts will appear first.

Example Output

With this SQL query, if you select categories “FRUIT” and “ROUND,” you can expect to receive sorted results like:

APPLE (2 matches: FRUIT and ROUND)

WHEEL (1 match: ROUND)

BANANA (1 match: FRUIT)

Conclusion

Using the FIND_IN_SET function combined with an ORDER BY on the count of matches can significantly enhance your product listing functionality. This method not only streamlines your query but also optimizes the way results are presented, ensuring that your users see the most relevant items first.

Explore this approach in your applications to provide your users with the best possible experience when they are browsing products based on their interests!