ScanRequest.Select Property

The attributes to be returned in the result. You can retrieve all item attributes, specific item attributes, the count of matching items, or in the case of an index, some or all of the attributes projected into the index.

• ALL_ATTRIBUTES: Returns all of the item attributes. For a table, this is the default. For an index, this mode causes Amazon DynamoDB to fetch the full item from the table for each matching item in the index. If the index is configured to project all item attributes, the matching items will not be fetched from the table. Fetching items from the table incurs additional throughput cost and latency.
• ALL_PROJECTED_ATTRIBUTES: Retrieves all attributes which have been projected into the index. If the index is configured to project all attributes, this is equivalent to specifying ALL_ATTRIBUTES.
• COUNT: Returns the number of matching items, rather than the matching items themselves.
• SPECIFIC_ATTRIBUTES : Returns only the attributes listed in AttributesToGet. This is equivalent to specifying AttributesToGet without specifying any value for Select. If you are querying an index and request only attributes that are projected into that index, the operation will read only the index and not the table. If any of the requested attributes are not projected into the index, Amazon DynamoDB will need to fetch each matching item from the table. This extra fetching incurs additional throughput cost and latency.

When neither Select nor AttributesToGet are specified, Amazon DynamoDB defaults to ALL_ATTRIBUTES when accessing a table, and ALL_PROJECTED_ATTRIBUTES when accessing an index. You cannot use both Select and AttributesToGet together in a single request, unless the value for Select is SPECIFIC_ATTRIBUTES. (This usage is equivalent to specifying AttributesToGet without any value for Select.)

Constraints:Allowed ValuesALL_ATTRIBUTES, ALL_PROJECTED_ATTRIBUTES, SPECIFIC_ATTRIBUTES, COUNT

Syntax

public Select Select { get; set; }

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