需要提取created_date和last_updated_date的最大日期并删除旧记录-请帮助store_proc
表名称：销售
表记录：
Country Region Sales Created_Date Text Last_updated_date
United Kingdom London 99 05-05-18 12:30 ABC NULL
United Kingdom London 100 05-05-18 12:30 ABC 07-05-19 12:30
Canada British 300 06-02-19 12:30 NULL NULL
Canada British 300 06-02-19 12:30 NULL 08-02-19 12:30
India Chennai 499 10-02-19 12:30 XYZ NULL
India Chennai 600 11-02-19 12:30 XYZ NULL
India Chennai 900 12-02-19 12:30 XYZ NULL
Australia Victoria 60 21-02-19 12:30 ASD 22-02-19 12:30
Australia Victoria 90 23-02-19 12:30 ASD 24-02-19 12:30
必选输出：
Country Region Sales Created_Date Text Last_updated_date
United Kingdom London 100 05-05-18 12:30 ABC 07-05-19 12:30
Canada British 300 06-02-19 12:30 NULL 08-02-19 12:30
India Chennai 900 12-02-19 12:30 XYZ NULL
Australia Victoria 90 23-02-19 12:30 ASD 24-02-19 12:30
I tried considering max date of two date columns, but unable to delete NULL records which are in date column
DELETE A1 from Sales A1
Join
(SELECT
Country, Region, Text, Sales,
(SELECT MAX(RevisedDate)
FROM (VALUES (created_date),(last_updated_date)) AS UpdateDate(RevisedDate))
AS RevisedDate
FROM Sales) A2
on A1.[Country] = A2.[Country]
and A1.[Region] = A2.[Region]
and A1.[Text] = A2.[Text]
and A1.[Sales] != A2.[Sales]
where A1.created_date < A2.RevisedDate