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Скачать или смотреть How to Use Subquery in Laravel Eloquent selectRaw Method

  • vlogize
  • 2025-05-27
  • 0
How to Use Subquery in Laravel Eloquent selectRaw Method
how to use subquery in laravel eloquent selectRaw method?laravel
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Описание к видео How to Use Subquery in Laravel Eloquent selectRaw Method

Discover the effective way to implement subqueries in Laravel's Eloquent selectRaw method, tailored for counting users and messages efficiently.
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This video is based on the question https://stackoverflow.com/q/65373414/ asked by the user 'MMD' ( https://stackoverflow.com/u/14071726/ ) and on the answer https://stackoverflow.com/a/65374152/ provided by the user 'SEYED BABAK ASHRAFI' ( https://stackoverflow.com/u/6212294/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

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Mastering Subqueries in Laravel Eloquent's selectRaw Method

When developing applications with Laravel, it's common to need complex queries to gather specific data. One such task might include wanting to count unique users who started chats and also aggregate the total messages sent. This requirement can become tricky, especially when trying to utilize the selectRaw method effectively within Eloquent. In this guide, we’ll break down how to achieve this efficiently using subqueries in Laravel Eloquent.

The Problem Statement

Imagine you have a chats table in your database that stores messages exchanged between users. The columns in the chats table include:

id: The unique identifier for each chat message.

user_id: The ID of the user who sent the message.

message: The content of the message.

created_at: The timestamp when the message was sent.

You want to compile statistics that show, for each day, how many users started chats and the total number of messages exchanged on that day. Your desired output might look like the following:

DateNumber of UsersNumber of Messages19/12/202052520/12/2020XYYour current query might look something like this:

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

However, you are still not getting the desired results because of how subqueries and grouping work together in Laravel Eloquent. So, how do you correctly structure your query?

The Solution

Using Eloquent with Count and Group By

Laravel offers a straightforward way to handle counting with Eloquent. Instead of using complex subqueries in selectRaw, you can simplify your code using the following approach:

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

Breaking Down the Code

Let’s dissect the code above for clarity:

Selecting the Date:

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

This line extracts the date from the created_at timestamp for grouping purposes.

Grouping by Date:

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

This ensures that all records are grouped by each unique date, allowing us to aggregate the counts correctly based on each day.

Counting Unique Users:

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

Here we count the distinct user_ids for each grouped date, which gives us the total number of unique users who started chats.

Counting Total Messages:

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

This counts all messages sent for each day, regardless of the user.

Final Thoughts

Utilizing Laravel's Eloquent in this way keeps your code clean and understandable while allowing you to obtain the necessary aggregates. By avoiding overly complex subqueries within selectRaw, you can effectively retrieve your desired results with minimal fuss.

Feel free to experiment with the queries and tweak them to fit your application's unique requirements. Happy coding!

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