```json { "table_name": "2017", "primary_key": "Country", "candidates": [ { "rank": 0, "partition_key": "Country", "partition_key_label": "primary_identifier", "partition_key_reasoning": "Country is the unique identifier for this dimension table. RPUV=1.00, uniqueness=1.000, each country appears exactly once. This is a snapshot of world happiness metrics for the year 2017, with Country serving as the natural primary key.", "clustering_key": null, "clustering_key_label": null, "clustering_key_reasoning": "Dimension tables typically do not require clustering keys as they are reference tables without internal ordering requirements.", "world_line": null, "session_column": null, "confidence": "HIGH", "notes": "This is a dimension table containing happiness metrics for 155 countries in 2017. The table name itself indicates the temporal scope (2017), and cross_table_context shows similar tables for other years (2015, 2016, 2018, 2019), suggesting this is part of a yearly snapshot series. Country is the clear primary identifier with perfect uniqueness." } ] } ```