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Mastering DynamoDB by Tanmay Deshpande

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Query and scan operations

The query operation is a very important operation that allows us to fetch specific items from the given table. It needs a primary input and an optional start key to compare with the list of items. The query fetches all matching entries to the input from a given table. You can also use comparison operations, such as greater than, less than, contains, between, and so on to narrow down the result set. Data returned from a query or scan operation is limited to 1 MB. If it does not find any matching items with respect to a given input key, it returns an empty set.

Query results are always sorted in the order of the range key value. By default, the order of sorting is ascending. If a table has secondary index, then the query ...

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