sql语句书写升降序

1， desc：降序，明天今天昨天，zyx...cba，.....321

　　sql语句：select * from SC_BackDiggingInfo where WriteDate<='2013-08-31' order by WriteDate desc

　　例如：　　　　　　

WriteDate

2013-08-28 00:00:00.000

2013-08-27 00:00:00.000

2013-08-26 00:00:00.000

2013-08-25 00:00:00.000

2013-08-24 00:00:00.000

2013-08-23 00:00:00.000

2013-08-22 00:00:00.000

2， asc：升序，昨天今天明天,abc...xyz,123......

　　sql语句：select * from SC_BackDiggingInfo where WriteDate<='2013-08-31' order by WriteDate asc

　　例如：