How to Retrieve the Latest Row for Each Seller in Laravel Eloquent?

Retrieving Latest Rows for Each Seller ID in Laravel Eloquent

This article addresses the challenge of retrieving the most recent row for each unique seller in a database table. We will explore a solution using the Laravel Eloquent ORM to achieve this goal.

The given table contains data for sales, including seller IDs, amounts, and creation timestamps. To obtain the latest row for a specific seller, the query can be written as:

<code class="php">$sales = Snapshot::where('seller_id', '=', 15)
->orderBy('created_at', 'DESC')
->first();</code>

To extend this functionality to retrieve the latest rows for all sellers, we employ a more advanced query. The following query utilizes a subquery to identify the latest row for each seller:

<code class="sql">select s.*
from snapshot s
left join snapshot s1 on s.seller_id = s1.seller_id
and s.created_at < s1.created_at
where s1.seller_id is null

To use this query in Laravel's query builder, the following code can be implemented:

<code class="php">DB::table('snapshot as s')
->select('s.*')
->leftJoin('snapshot as s1', function ($join) {
    $join->on('s.seller_id', '=', 's1.seller_id')
         ->whereRaw(DB::raw('s.created_at < s1.created_at'));
})
->whereNull('s1.seller_id')
->get();</code>

Through this solution, you can efficiently retrieve the latest row for each seller in the database table, providing convenient access to the most up-to-date data for your application.

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