The table's primary key consists of the PartitionKey and RowKey combined; it is the only index for the table and it allows for faster retrieval of data by holding low-level addresses to rows. The rows in a table will always be sorted by the PartitionKey, then the RowKey, and querying a table will also return results sorted by its primary key. Since keys are of string type, it is good to have fixed size keys to ensure good sorting results. For instance, in a query result, an entity with RowKey 123 will appear before an entity with RowKey 2; to fix this it is better to pad out your key to become 002.