本文介绍了如何从卡号区别选择日期值的最大值的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
ProcessDate ProcessTime CardNo EffectiveDate EffectiveTime ExpireDate ExpireTime
12/21/2011 10:04:14 0749 12/21/2011 00:00
12/21/2011 10:06:04 0749 12/21/2011 00:00
12/21/2011 23:17:37 0095 12/21/2011 00:00
12/29/2011 16:26:57 0095 12/29/2011 00:00
07/09/2013 13:00:14 0749 07/09/2013 00:00
07/09/2013 14:33:24 0749 07/09/2013 00:00
07/10/2013 12:42:58 0749 07/10/2013 12:30
08/01/2013 11:39:59 0019 01/08/2013 11:30
12/21/2011 10:30:20 0749 12/21/2011 10:30
01/31/2012 00:00:38 0095 01/31/2012 00:00
07/09/2013 14:33:26 0749 07/09/2013 14:30
07/10/2013 12:30:03 0749 07/10/2013 12:30
07/10/2013 13:23:15 0749 07/10/2013 13:00
07/10/2013 14:28:59 0749 07/10/2013 14:00
08/11/2013 14:59:23 0749 07/10/2013 14:30
I need to select the maximum value of EffectiveDate (MM/dd/yyyy).but that EffectiveDate is taken in string value and also search by CardNo also. that code also write in below is there.
i Want Result would be:
ProcessDate ProcessTime CardNo EffectiveDate EffectiveTime ExpireDate ExpireTime
07/10/2013 12:42:58 0749 07/10/2013 12:30
12/29/2011 16:26:57 0095 12/29/2011 00:00
08/01/2013 11:39:59 0019 01/08/2013 11:30
but i tried one code.
var AutoEffectExpireData = " SELECT * FROM (SELECT AutoEffectExpireData.CardNo,Max(AutoEffectExpireData.EffectiveDate) AS EffectiveDate FROM AutoEffectExpireData GROUP BY AutoEffectExpireData.CardNo ) AS CardNo INNER JOIN AutoEffectExpireData t1 ON CardNo.CardNo = t1.CardNo and CardNo.EffectiveDate = t1.EffectiveDate ";
but output is came like this.
ProcessDate ProcessTime CardNo EffectiveDate EffectiveTime ExpireDate ExpireTime
12/21/2011 10:04:14 0749 12/21/2011 00:00
12/29/2011 16:26:57 0095 12/29/2011 00:00
08/01/2013 11:39:59 0019 01/08/2013 11:30推荐答案
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