SQL SERVER 连续两个desc 和 Update From 用法

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UPDATE MyTable SET lastdate = CASE ISNULL(date,'') WHEN '' THEN lastdate ELSE date END,
                               lasttime = CASE ISNULL(time,'') WHEN '' THEN lasttime ELSE time END
        FROM (SELECT TOP 1 date,time FROM OtherTable ORDER BY date DESC,time DESC) AS A

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