{"id":"dynamodb-if-not-exists-list-append-set-only","text":"DynamoDB `if_not_exists()` and `list_append()` are functions available only within the `SET` action of UpdateExpression.","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-if-not-exists-list-append-set-only","truth_value":"IN","reason":"premise"}]}}