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       select ×Ö¶ÎÃû from ±íÃû where Ìõ¼þ order by ÅÅÐò
see:select distinct ´Ó¶à¸öÏàͬ×Ö¶ÎÖÐץΨһֵ    
see:²éÕÒld_det_andy±íÖÐÓÐÊý¾Ýµ«ld_det_temp±íÖÐûÊý¾ÝµÄÊý¾Ý
        select * from ld_det_andy a where
       (not exists (select * from ld_det_temp where ld_loc = a.ld_loc and ld_part = a.ld_part))
see:Ñ¡³öÀۼƷÃÎÊÁ¿×î´óµÄ10¸öipµØÖ·£¬²¢°´·ÃÎÊÁ¿½µÐòÅÅÁС£
        select top 10 ip, countip from
       (select ip,count(*) as countip from records group by ip) a
       order by countip desc
see:±ístudent(id,name,score)¸ù¾Ý·ÖÊýÁУ¨score£©Ã¿10·ÖΪһ¶Î£¬²éѯÿ¶Î·ÖÊýµÄÈËÊý
        select ScoreRank,count(*) from
       (select ScoreRank = case
         when score >= 0   and score < 10   then '0-9'
         when score >= 10 and score < 20   then '10-19'
         when score >= 20 and score < 30   then '20-29'
         when score >= 30 and score < 40   then '30-39'
         when score >= 40 and score < 50   then '40-49'
         when score >= 50 and score < 60   then '50-59'
          when score >= 60 and score < 70   then '60-69'
         when score >= 70 and score < 80   then '70-79'
         when score >= 80 and score < 90   then '80-89'
  &nb