EDD_DB::get()
Method: Retrieve a row by the primary key
Source: includes/class-edd-db.php:71
EDD_DB::get_by()
Method: Retrieve a row by a specific column / value
Source: includes/class-edd-db.php:82
EDD_DB::get_column()
Method: Retrieve a specific column’s value by the primary key
Source: includes/class-edd-db.php:94