As the category is the sort key. ... (use ScanIndexForward to False to reverse order to descending) Capacity Modes. The query should at least contain the partition key which in our case in the Author. Definitely want to use a query instead of a scan. I checked my items with a SELECT but was limited in the ORDER BY clause. The query operation always returns a result set in the items key, which can be empty if no record is found matching the criteria specified by the query. DynamoDB has two capacity modes, ... aws dynamodb query finds items based on primary key values. When we query for GSI1PK = “User-1/Folder-1/” and sort the results by GSI1SK in descending key order, the first result is Folder-1 (because ~ comes after all other keys) and the following results are File-2 and File-3 in descending date order. You will have an option to specify what query you want to perform. I just put out a video on Querying DynamoDB from Lambda. If the table or index has a sort key, you can refine the results by providing a sort key value and a condition. By specifying a Sort Key, the table’s Primary Key becomes a composite of the Partition Key and Sort Key. You cannot query using category only. Use the SELECT statement to retrieve data from a table in Amazon DynamoDB.. The query processes by performing retrievals in sort key order, and using any condition and filter expressions present. level 2. ScanIndexForward: Specifies the order for index traversal: If true (default), the traversal is performed in ascending order; if false, the traversal is performed in descending order. Query by Partition Key Sort Key. Search Forum : Advanced search options This thread is locked - replies are not allowed. Items with the same partition key value are stored in sorted order by sort key. When using a Sort key, records on the partition are logically grouped together in Ascending order. Here is the most important to understand: there are no additional data processing engine here. By Franck Pachot . The composite primary key enables sophisticated query patterns, including grabbing all items with the given partition key or using the sort key to narrow the relevant items for a particular query. The results always return in sort key order, and data type based order with the modifiable default as the ascending order. You must provide a partition key value and an equality condition. The Sort Key isn’t used in the above query, as specifying a Sort Key is optional in a query statement. Discussion Forums > Category: Database > Forum: Amazon DynamoDB > Thread: Query Data using multiple partition keys and sort key descending. I'm using Date as a sort … You can query any table or secondary index that has a composite primary key (a partition key and a sort key). The Query operation enables you to query a table or a secondary index in Amazon DynamoDB. For more on interacting with items, start with the lesson on the anatomy of an item . For more information, see ConditionalOperator in the Amazon DynamoDB Developer Guide. A scan operation examines every item for the requested values and can use up the provisioned throughput for a large table or index in a single operation. Note that this increases how many writes you get charged for. Queries always return a result set, and on no matches, it returns an empty one. Description¶. Once you select the query option. In the previous post I insertd a few rows in a Demo table using the SQL-like new API on DynamoDB. The Query operation will return all of the items from the table or index with that partition key value. To get them sorted, you need to use a sort key. If your table doesn’t have a sort key, create a GSI with one. Use the KeyConditionExpression parameter to provide a specific value for the partition key. 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