ID Date1 Date2 Date3
158 5/3/13 15:11 2/20/13 11:38 2/20/13 11:38
我想从这三列中获取最新日期。
SELECT CASE WHEN Date1 IS NOT NULL
AND Date1>=COALESCE(Date2,CAST('0001-01-01 00:00' AS DATETIME2))
AND Date1>=COALESCE(Date3,CAST('0001-01-01 00:00' AS DATETIME2)) THEN Date1
WHEN Date2 IS NOT NULL
AND Date2>=COALESCE(Date1,CAST('0001-01-01 00:00' AS DATETIME2))
AND Date2>=COALESCE(Date3,CAST('0001-01-01 00:00' AS DATETIME2)) THEN Date2
WHEN Date3 IS NOT NULL
AND Date3>=COALESCE(Date1,CAST('0001-01-01 00:00' AS DATETIME2))
AND Date3>=COALESCE(Date2,CAST('0001-01-01 00:00' AS DATETIME2)) THEN Date3
END AS latest
FROM t1
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我来说两句