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
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