SQL¾­µä¶ÌС´úÂëÊÕ¼¯

--SQL Server£º
Select TOP N * from TABLE Order By NewID() 
--Access£º
Select TOP N * from TABLE Order By Rnd(ID)  
Rnd(ID) ÆäÖеÄIDÊÇ×Ô¶¯±àºÅ×ֶΣ¬¿ÉÒÔÀûÓÃÆäËûÈκÎÊýÖµÀ´Íê³É£¬±ÈÈçÓÃÐÕÃû×Ö¶Î(UserName) 
Select TOP N *  from TABLE Order BY Rnd(Len(UserName)) 
--MySql£º
Select * from TABLE Order By Rand() Limit 10  
--¿ªÍ·µ½NÌõ¼Ç¼
Select Top N * from ±í
--Nµ½MÌõ¼Ç¼(ÒªÓÐÖ÷Ë÷ÒýID)
Select Top M-N * from ±íWhere ID in (Select Top M ID from ±í) Order by ID  Desc
--Ñ¡Ôñ10´Óµ½15µÄ¼Ç¼
select top 5 * from (select top 15 * from table order by id asc) table_±ðÃûorder by id desc 
--Nµ½½áβ¼Ç¼
Select Top N * from ±íOrder by ID Desc
 
--ÏÔʾ×îºó5Ìõ¼Ç¼,µ«ÊÇÏÔʾµÄ˳Ðò±ØÐëΪ5,6,7,8,9,10,¶ø²»ÊÇ10,9,8,7,6,5 ÈçϽâ¾ö·½·¨:
select top 5 from test where id in(select top 5 from test order by id desc) order by id asc
--ͨ¹ýÕâ¸öÎÊÌâÒ²ÄÜ×ܽá³ö4-10Ìõ,5-100ÌõÕâÖÖÏÞ¶¨Ò»¶¨·¶Î§ÄÚµÄsqlÓï¾äµÄд·¨:
select top <Ä©¶ËID-¶¥¶ËID+1> * from <±íÃû> where ID not in(select top <¶¥¶ËID-1>) ID from <±íÃû>)
--ÀýÈç:4-10Ìõ¾ÍÓ¦¸Ãд³É
select top 10-4+1 * from test where id not in(select top 4-1 id from test)
 ÉÏһƪ: select top 1 * from [news_table] where [ÐÂÎűêʶÁÐ]<µ±Ç°idºÅ where ......
 ÏÂһƪ: select top 1 * from [news_table] where [ÐÂÎűêʶÁÐ]>µ±Ç°idºÅ where ...... order by [ÐÂÎűêʶÁÐ] desc --Á½Ìõ¼Ç¼ÍêÈ«Ïàͬ£¬ÈçºÎɾ³ýÆäÖÐÒ»Ìõ
set rowcount=1 
delete from thetablename where id=@duplicate_id--@duplicate_idΪÖظ´ÖµµÄid 
--Ä£ºý²éѯ
select * &nbs