sql query to find percentage of null values in a table
SELECT 100.0 * SUM(CASE WHEN Column1 IS NULL THEN 1 ELSE 0 END) / COUNT(*) AS Column1Percent, 100.0 * SUM(CASE WHEN Column2 IS NULL THEN 1 ELSE 0 END) / COUNT(*) AS Column2Percent, 100.0 * SUM(CASE WHEN Column3 IS NULL THEN 1 ELSE 0 END) / COUNT(*) AS Column3Percent FROM #perc
