求一sql语句,急用哦
表1:hot,包括字段(id,tid) 
 表2:xxb,包括(id,tid,xm,xb,nl,bz)   
 在xxb找出xxb.tid=hot.tid前5条不重复信息,假如不足5条,则把bz=1的凑成5条 
------解决方案--------------------SELECT distinct top 5 a.* FROM xxb as a INNER JOIN hot as b ON a.tid = b.tid
------解决方案--------------------select top 5 * from ( 
 select distinct xxb.*,flag = 1 from hot,xxb  
 where hot.tid = xxb.tid 
 union 
 select distinct xxb.*,flag = 2 from xxb  
 where bz = 1) a 
 order by flag,id
------解决方案--------------------似乎排序应指定一下: 
 order by flag asc ,id desc