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--·Ö½â×Ö·û´®°üº¬µÄÐÅÏ¢ÖµºóÈ»ºóºÏ²¢µ½ÁíÍâÒ»±íµÄÐÅÏ¢
--(°®Ð¾õÂÞ.ع»ª(Ê®°ËÄê·çÓê,ÊصñùɽѩÁ«»¨¿ª)  2007-12-23  ¹ã¶«ÉîÛÚ)
/*ÎÊÌâÃèÊö
tba
ID  classid   name
1     1,2,3   Î÷·þ
2     2,3     ÖÐɽװ
3     1,3     Ãû¿ã
tbb
id   classname
1     Ò·þ
2     ÉÏÒÂ
3     ¿ã×Ó
ÎҵõĽá¹ûÊÇ
id   classname            name
1     Ò·þ,ÉÏÒÂ,¿ã×Ó      Î÷·þ
2     ÉÏÒ£¬¿ã×Ó          ÖÐɽװ
3     Ò·þ£¬¿ã×Ó          Ãû¿ã
*/
-----------------------------------------------------
--sql server 2000ÖеÄд·¨
create table tba(ID int,classid varchar(20),name varchar(10))
insert into tba values(1,'1,2,3','Î÷·þ')
insert into tba values(2,'2,3'  ,'ÖÐɽװ')
insert into tba values(3,'1,3'  ,'Ãû¿ã')
create table tbb(ID varchar(10), classname varchar(10))
insert into tbb values('1','Ò·þ')
insert into tbb values('2','ÉÏÒÂ')
insert into tbb values('3','¿ã×Ó')
go
--µÚ1ÖÖ·½·¨£¬´´½¨º¯ÊýÀ´ÏÔʾ
create function f_hb(@id varchar(10))
returns varchar(1000)
as
begin
  declare @str varchar(1000)
  set @str=''
  select @str=@str+','+[classname] from tbb where charindex(','+cast(id as varchar)+',',','+@id+',')>0
  return stuff(@str,1,1,'')
end
go
select id,classid=dbo.f_hb(classid),name from tba
drop function f_hb
/*
id          classid       name      
----------- ------------- ----------
1           Ò·þ,ÉÏÒÂ,¿ã×Ó Î÷·þ
2   &


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sql group by Óë havingµÄÓ÷¨

1. GROUP BY ÊÇ·Ö×é²éѯ, Ò»°ã GROUP BY ÊǺ;ۺϺ¯ÊýÅäºÏʹÓÃ
group by ÓÐÒ»¸öÔ­Ôò,¾ÍÊÇ select ºóÃæµÄËùÓÐÁÐÖÐ,ûÓÐʹÓþۺϺ¯ÊýµÄÁÐ,±ØÐë³öÏÖÔÚ group by ºóÃ棨ÖØÒª£©
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java Annotation Æ´×°SQLÓï¾ä

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@Target(ElementType.FIELD)  
@Retention(RetentionPolicy.RUNTIME) 
public @interface FiledRef
{
    String fieldName();
}
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@Retention(RetentionPolicy.RUNTIME)
public @interface TableRef
{
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