{"id":"dynamodb-item-collection-requires-composite-key","text":"DynamoDB item collections (groups of items sharing the same partition key value) only exist on tables or indexes with composite primary keys (partition key + sort key), not on tables with only a partition key.","truth_value":"IN","source":"entries/2026/03/11/amazondynamodb-latest-developerguide-WorkingWithItemCollectionshtml.md","source_url":"","source_hash":"ad849e481dc81368","justifications":[],"dependents":[],"metadata":{},"explanation":{"steps":[{"node":"dynamodb-item-collection-requires-composite-key","truth_value":"IN","reason":"premise"}]}}