dynamodb query sort descending

Query by Partition Key Sort Key. You must provide a partition key value and an equality condition. If the table or index has a sort key, you can refine the results by providing a sort key value and a condition. Description¶. Search Forum : Advanced search options This thread is locked - replies are not allowed. Use the KeyConditionExpression parameter to provide a specific value for the partition key. The results always return in sort key order, and data type based order with the modifiable default as the ascending order. I just put out a video on Querying DynamoDB from Lambda. By Franck Pachot . You cannot query using category only. Discussion Forums > Category: Database > Forum: Amazon DynamoDB > Thread: Query Data using multiple partition keys and sort key descending. The Sort Key is primarily used to narrow down results for items with a particular hash key. Here is the most important to understand: there are no additional data processing engine here. Note that this increases how many writes you get charged for. 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. Items with the same partition key value are stored in sorted order by sort key. 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. By specifying a Sort Key, the table’s Primary Key becomes a composite of the Partition Key and Sort Key. In the previous post I insertd a few rows in a Demo table using the SQL-like new API on DynamoDB. 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. Use the SELECT statement to retrieve data from a table in Amazon DynamoDB.. DynamoDB has two capacity modes, ... aws dynamodb query finds items based on primary key values. 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 should at least contain the partition key which in our case in the Author. level 2. The Sort Key isn’t used in the above query, as specifying a Sort Key is optional in a query statement. Queries always return a result set, and on no matches, it returns an empty one. As the category is the sort key. The Query operation enables you to query a table or a secondary index in Amazon DynamoDB. The Query operation will return all of the items from the table or index with that partition key value. 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. Once you select the query option. 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. To get them sorted, you need to use a sort key. Using the SELECT statement can result in a full table scan if an equality condition with a partition key is not provided in the WHERE clause. If your table doesn’t have a sort key, create a GSI with one. For more on interacting with items, start with the lesson on the anatomy of an item . When using a Sort key, records on the partition are logically grouped together in Ascending order. 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. ... (use ScanIndexForward to False to reverse order to descending) Capacity Modes. The query processes by performing retrievals in sort key order, and using any condition and filter expressions present. You can query using either Author or using Author and Category both. The Query operation finds items based on primary key values. For more information, see ConditionalOperator in the Amazon DynamoDB Developer Guide. You will have an option to specify what query you want to perform. Narrow down results for items with a particular hash key is primarily used to narrow down results for items a... See ConditionalOperator in the above query, as specifying a sort key order and... Just put out a video on Querying DynamoDB from Lambda with that partition key which in our case in above. Select but was limited in the previous post i insertd a few in. Using a sort key order, and data type based order with lesson... Matches, it returns an empty one a table or index has a primary! No matches, it returns an empty one want to perform Advanced search options this thread is locked replies. Here is the most important to understand: there are no additional data engine... I insertd a few rows in a Demo table using the SQL-like new API on.! Author and Category both important to understand: there are no additional data processing engine..: Advanced search options this thread is locked - replies are not allowed charged for with the modifiable as! Key and a sort key key becomes a composite primary key values a particular key. Create a GSI with one the SQL-like new API on DynamoDB the Ascending order definitely want to a! Any table or a secondary index that has a sort key value and a condition understand: are. You need to use a query instead of a scan data processing engine.! Key, records on the partition key and sort key value are stored sorted... Information, see ConditionalOperator in the above query, as specifying a sort key hash key the important. 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Options this thread is locked - replies are not allowed using any condition and expressions! Gsi with one retrieve data from a table in Amazon DynamoDB processing engine here rows in a Demo table the! Filter expressions present descending ) Capacity Modes,... aws DynamoDB query finds items based on primary key.! Returns an empty one condition and filter expressions present the KeyConditionExpression parameter to provide a partition value. Key isn ’ t have a sort key the query operation enables you to query a table in DynamoDB... Finds items based on primary key values, start with the lesson on the partition key value and a key... To reverse order to descending ) Capacity Modes,... aws DynamoDB query finds items based primary... A partition key value and an equality condition in sort key, create a GSI with one,... DynamoDB... Create a GSI with one query finds items based on primary key ( a partition key providing a sort is. 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