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1.±ístuinfo
sid sname subs
1  jack  |1|2|
2  marry |1|4|
3  tom  |3|
2.±ísubinfo
subid  subname
1      physics
2      maths
3      biology
4      geography
ÎÒÏë°ÑstuinfoµÄsubs×ֶΰ´£ü×Ö·û·Ö¿ª£¬È»ºóÆ¥ÅäsubinfoµÄsubid£¬È¡subnameµÄÖµ£¬Æ¥Åäµ½¶à¸öµÄ»°¾ÍÓöººÅ¸ô¿ª¡£
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sid  sname subname
1    jack  physics,maths
2    marry physics,geography
3    tom  biology
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Oracle 10gÒÔÉÏ°æ±¾
select a.sid,a.sname,wm_concat(b.subname) subname
from stuinfo a,subinfo b
where instr(a.subs,'|'||b.subid(+)||'|')>0
group by a.sid,a.sname
9iµÄ
 select sid,sname,substr(max(sys_connect_by_path(subname,',')),2) subname
from (
select a.sid,a.sname,b.subname,
row_number()over(partition by a.sid order by rownum)rn
from stuinfo a,subinfo b
where instr(a.subs,'|'||b.subid(+)||'|')>0)
connect by prior rn=rn-1 and prior sid=sid
start with rn=1
group by sid,sname


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