mysql中的錯誤1248

Question

我試圖運行這個查詢。

select * 
from (select * 
     from student 
     where dept_name= ’Comp. Sci’) 
     natural left outer join 
    (select * 
     from takes 
     where semester = ’Spring’ and year = 2009); 

但每次我拿到

error# 1248: every derived table must have its own alias. 

我曾嘗試創建正在產生，但同樣的錯誤每次出現的所有表的別名。

我該如何解決這個問題。我查了一些已經回答的問題，但沒有運氣。

Answer 1

試試這個:::

select * from 
(select * from student s where dept_name= ’Comp. Sci’) as tempLeft 
left join (select * from takes t where semester = ’Spring’ and year = 2009) on (// join condition) 

Answer 2

添加別名子查詢：

select * 
from 
    (select * from student s where dept_name= 'Comp. Sci') as data1 
    natural left outer join (select * from takes t where semester = 'Spring' and year = 2009) as data2;