怎么样：
SELECt TOP 5 Date, Val FROM (SELECt Date, A as Val FROM T UNIOn ALL SELECt Date, B FROM T UNIOn ALL SELECt DATE, C FROM T) AS xORDER BY x.Val DESC
怎么样：
SELECt TOP 5 Date, Val FROM (SELECt Date, A as Val FROM T UNIOn ALL SELECt Date, B FROM T UNIOn ALL SELECt DATE, C FROM T) AS xORDER BY x.Val DESC
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