<invoke name="tool_call"> <parameter name="reasoning">analytics.column_overview holds null_count per column; join to table_overview row_count to get percent missing for all 78 columns in one query.</parameter> <parameter name="tool">query_sql</parameter> <parameter name="args">{"sql": "SELECT c.table_name, c.column_name, c.null_count, t.row_count, ROUND(100.0 * c.null_count / t.row_count, 2) AS pct_missing FROM analytics.column_overview c JOIN analytics.table_overview t ON c.table_name = t.table_name WHERE c.null_count > 0 ORDER BY pct_missing DESC", "purpose": "List all columns with missing values and percent missing", "source": "raw"}</parameter> </invoke>