sqlite子查詢語法錯誤

Question

我在此子查詢中有一個語法錯誤，似乎無法弄清楚為什么它不起作用。 所有括號都匹配

select min(max_s) 
from 
(select max(salary) from instructor group by dept_name) 
as s(max_s);

Error: near "(": syntax error

Answer 1

采用：

SELECT MIN(x.max_s) 
  FROM (SELECT MAX(i.salary) AS max_s 
          FROM INSTRUCTOR i
      GROUP BY i.dept_name) x

Answer 2

問題出在AS s(max_s)表別名中，該別名看起來不太正確。 您應該在子查詢中為列名加上別名，例如：

select min(s.max_s) 
from 
(select max(salary) as max_s from instructor group by dept_name) 
as s

Answer 3

不要在表別名后面加上括號。