```json { "classifications": [ { "column": "state_id", "role": "identifier", "confidence": 1.0, "reason": "Primary key with unique sequential integers (622 distinct values in 622 rows)" }, { "column": "State", "role": "dimension", "confidence": 0.95, "reason": "State names used for grouping and filtering; 620 distinct values suggests categorical dimension" }, { "column": "country_id", "role": "identifier", "confidence": 1.0, "reason": "Foreign key referencing country table; used for joins despite repetition (27 distinct values)" }, { "column": "hasbrewer", "role": "measure", "confidence": 0.9, "reason": "Numeric values (0-2483) representing count or quantity of brewers; suitable for aggregation" }, { "column": "msrepl_tran_version", "role": "identifier", "confidence": 1.0, "reason": "UUID/GUID for replication tracking; unique per row (622 distinct), never aggregated" } ] } ```