问下，这个SQL语句应该如何优化

问下，这个SQL语句应该怎么优化
select * from 
(
  select * from tb1 
)
left join
(
 select * from tb2
)
where .....

[解决办法]

SQL code

select * from tbl a left join tb2 b on a.col=b.colwhere ......
[解决办法]
select * from tb1
   left join   tb2 on ....
where .....
[解决办法]
select *  
from tb1 
left join tb2 on ...
where ...