{"id":"dynamodb-add-action-number-and-set-only","text":"The `ADD` action in DynamoDB UpdateExpression only supports Number and Set types; it initializes a non-existent numeric attribute to 0 before adding.","truth_value":"IN","source":"entries/2026/03/11/amazondynamodb-latest-APIReference-API_UpdateItemhtml.md","source_url":"","source_hash":"3e4e050a17f9475f","justifications":[],"dependents":[],"metadata":{},"explanation":{"steps":[{"node":"dynamodb-add-action-number-and-set-only","truth_value":"IN","reason":"premise"}]}}