Laravel's Eloquent ORM has a method called `whereColumn()` that allows you to add conditions based on specific column values being equal or not equal within the same row. It can simplify complex queries and is useful for tasks like retrieving customers with certain payment methods where they have made a purchase.
Eloquent, Laravel's ORM system, uses the `id` column as its default primary key by default. However, you can customize it by specifying a custom name using `$primaryKey`, changing the data type using `$keyType`, or combining multiple columns as the primary key.
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