What is Query in DynamoDB?
The Query operation in Amazon DynamoDB searches for items based on primary key values. The query returns all items with that partition key value. Optionally, you can provide a sort key attribute and use a comparison operator to refine the search results.
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What is the difference between scan and query in DynamoDB?
A query operation as specified in the DynamoDb documentation: A query operation searches only primary key attribute values and supports a subset of comparison operators on key attribute values to refine the search process. and the scan operation: A scan operation scans the entire table.
What kind of query functionality does DynamoDB support?
GET/PUT operations
Q: What kind of query functionality does DynamoDB support? DynamoDB supports GET/PUT operations through the use of a user-defined primary key. The primary key is the only attribute required for the elements of a table. You specify the primary key when you create a table, and it uniquely identifies each element.
Can I query DynamoDB with SQL?
You can now use a SQL-compatible query language to query, insert, update, and delete data from tables in Amazon DynamoDB. With PartiQL, DynamoDB continues to deliver consistent single-digit millisecond latency at any scale.
What happens to the results of a DynamoDB query?
A query operation always returns a result set. If no matching elements are found, the result set is empty. Query results are always sorted by the value of the sort key. If the data type of the sort key is Number, the results are returned in numerical order.
How are search criteria specified in DynamoDB?
To specify the search criteria, you use a key condition expression, a string that determines the items to read from the table or index. You must specify the name and value of the partition key as an equality condition. You can optionally provide a second condition for the sort key (if present).
What type of database does AWS DynamoDB use?
As a quick introduction, AWS DynamoDB is a key-value and document database that delivers blazing-fast performance at any scale. The architecture of this module is shown in the image above.
What is the primary key model in DynamoDB?
Whether you’re an experienced Amazon DynamoDB user or just getting started, you’re probably familiar with the basics of the DynamoDB primary key model. This key model provides consistent single-digit millisecond performance at any scale.