<invoke name="query_sql"> <parameter name="sql">SELECT COUNT(*) AS n_rows, COUNT(DISTINCT company_name) AS companies, COUNT(DISTINCT stock_name) AS tickers, MIN(date) AS first_day, MAX(date) AS last_day, AVG(volume) AS avg_volume, MEDIAN(close) AS median_close, SUM(CASE WHEN date >= DATE '2022-11-30' THEN 1 ELSE 0 END) AS rows_since_chatgpt, SUM(CASE WHEN volume = 0 OR volume IS NULL THEN 1 ELSE 0 END) AS zero_volume_rows FROM raw.semi_conductor_se</parameter> <parameter name="purpose">Profile the dataset's scope (rows, companies, date range, volume) to ground the suggested questions</parameter> </invoke>