When you use Query on DynamoDB, it uses only primary key attribute values to perform a search on the table. You can further refine the result by using filters on attributes other than primary keys. Unlike a query, the Scan operation can perform a search on any attribute of the table. It also allows you to refine the search by applying filters to the scan result.
When you perform a Scan operation on a table, it reads all the items in the table or indexes and by default returns all the items and attributes. If you do not want to retrieve all the attributes, you can use the ProjectionExpression parameter to retrieve only specific attributes.
Irrespective of whether the items are found with the matching criteria or not, Scan always returns a result set. If items with the specified criteria are found, it returns the result set with the items; otherwise, it returns an...
