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 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.

The above is the detailed content of How to Retrieve Only the Latest Rows for Each Unique Seller ID using Laravel Eloquent?. For more information, please follow other related articles on the PHP Chinese website!