“SQL -Abfrage, um den Prozentsatz der Nullwerte in einer Tabelle zu finden” Code-Antworten

SQL -Abfrage, um den Prozentsatz der Nullwerte in einer Tabelle zu finden

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