One of the most efficient ways of retrieving data from a DynamoDB table is by using the query operation on the table. One of the mandatory parameters or conditions to be provided while performing a query operation is performing a comparison operation on the primary key attribute value. The query operation supports the following comparison operations, namely:

These seven comparison operations can be performed directly on primary key values, which will retrieve only the necessary items (without even bothering the partitions/items that don't have this value). There are six more comparison operations that can be performed on the items...