```json { "table_name": "2016", "primary_key": "Country", "candidates": [ { "rank": 0, "partition_key": "Country", "partition_key_label": "primary_identifier", "partition_key_reasoning": "Country is the unique identifier with RPUV=1.00, uniqueness=1.000, and 157 unique values (one per row). Each country appears exactly once in this 2016 snapshot, making it the natural primary identifier for this dimension table.", "clustering_key": null, "clustering_key_label": null, "clustering_key_reasoning": "Dimension tables typically do not require internal sorting. All attributes (happiness metrics, region, GDP factors) are descriptive properties of each country for the year 2016.", "world_line": null, "session_column": null, "confidence": "HIGH", "notes": "This is a dimension table representing country-level happiness metrics for 2016. The table name itself indicates the temporal snapshot (2016), and cross_table_context shows similar tables for other years (2015, 2017, 2018, 2019), suggesting this is one year's slice of a multi-year dataset. Country serves as the primary key with perfect uniqueness." } ] } ```