mysql左连接与oracle(+)使用对照

mysql左连接与oracle(+)使用对比 由于mysql不能像oracle一样使用(+)做外连接，使用left join或者right join需要注意 oracle： select a.aid aid , b.bid bid ,c.cid cid , d.did did , e.eid eid from tablea a , tableb b ,tablec c ,tabled d ,tablee e whe

oracle： 
select a.aid aid , b.bid bid ,c.cid cid , d.did did , e.eid eid 
from 
tablea a , 
tableb b ,
tablec c ,
tabled d ,
tablee e 
where
a.aid = b.aid (+)
and a.aid = c.aid(+)
and b.bid = d.bid (+)
and d.did = e.eid (+)
order by a.aid , b.bid , c.cid , d.did ,e.eid
;



mysql：
select a.aid aid , b.bid bid ,c.cid cid , d.did did , e.eid eid 
from 
tablea a left join 
 (
 tableb b left join 
 ( 
 tabled d left join tablee e 
 on (d.did = e.eid) 
 )
 on (b.bid = d.bid ) 
 )
 on ( a.aid = b.aid)
 left join tablec c 
 on a.aid = c.aid
order by a.aid , b.bid , c.cid , d.did ,e.eid
;