How to Retrieve Only the Latest Rows for Each Unique Seller ID using Laravel Eloquent?

Laravel Eloquent: Retrieve All Rows with Maximum 'created_at'

In Laravel, a common requirement arises when you need to retrieve only the latest rows for each unique value in a specific column. In a table like the one provided, where each row represents a sale, you may want to obtain the most recent sale for each seller.

To accomplish this using Laravel Eloquent, one approach is to modify the provided query in the question:

$sales = Snapshot::leftJoin('snapshot as s1', function ($join) {
  $join->on('s.seller_id', '=', 's1.seller_id')
       ->whereRaw('s.created_at < s1.created_at');
})
->whereNull('s1.seller_id')
->get();

This query achieves the desired outcome by introducing a left join to a copy of the 'snapshot' table, aliased as 's1'. The join is performed based on the 'seller_id' column and includes a condition that compares the 'created_at' values to ensure that only the latest rows for each seller are selected.

The 'whereNull' clause guarantees that for each seller, there is no subsequent row with a greater 'created_at' value. This identifies the rows with the maximum 'created_at' value for each unique 'seller_id'. By calling 'get()' on the resulting query, an array of all the latest sales grouped by seller is obtained.

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