How to Efficiently Perform Eloquent SUM and GROUP BY Queries in Laravel?

Eloquent Sum and Group By Queries in Laravel

In Laravel, the Eloquent ORM provides a convenient way to interact with the database. However, when working with large datasets, it can become necessary to perform complex queries that combine aggregation functions like SUM with grouping operations like GROUP BY.

The Challenge

One common scenario where this question arises is when you want to get the sum of a particular field while grouping the results by another field. For example, you might want to find the total number of pages written by each editor in a document database.

Solution 1: Using selectRaw and pluck

To achieve this, you can first group the results by the desired field using the groupBy method. Then, use the selectRaw method to define the calculation, and finally use the pluck method to create an array of the sum for each group:

Document::groupBy('users_editor_id')
   ->selectRaw('SUM(no_of_pages) AS sum, users_editor_id')
   ->pluck('sum', 'users_editor_id');

Solution 2: Using selectRaw and get

Alternatively, you can achieve a similar result using the selectRaw and get methods. However, this approach will return a collection of pseudo-models that includes the calculated sum as an additional field:

Document::groupBy('users_editor_id')
   ->selectRaw('*, SUM(no_of_pages) AS sum')
   ->get();

By leveraging these techniques, you can efficiently perform complex aggregation and grouping operations in your Eloquent queries to gain valuable insights from your database.

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