I need to check for duplicate rows in the dataset. Let me start by examining the structure and then look for exact duplicates. ```json { "action": "tool_call", "reasoning": "First, I'll check for exact duplicate rows by grouping on all columns and finding rows that appear more than once. I'll use the raw.championsdataset table and exclude the metadata columns (_ingestion_timestamp, _batch_id, _source_file, _source_system) since those are ingestion artifacts, not part of the actual data.", "tool": "query_sql", "args": { "sql": "SELECT No, Champion, Recognition, Begin_reign, End_reign, Days, Title_defenses, Additional_recognition, COUNT(*) as duplicate_count FROM raw.championsdataset GROUP BY No, Champion, Recognition, Begin_reign, End_reign, Days, Title_defenses, Additional_recognition HAVING COUNT(*) > 1 ORDER BY duplicate_count DESC", "purpose": "Find exact duplicate rows based on all data columns (excluding ingestion metadata)", "source": "raw" } } ```