Question

SELECT company_name
FROM empl_company s
WHERE NOT EXISTS 
(
    (SELECT city
     FROM empl_company
     WHERE company_name = 'Small Bank Corporation'
     )
     EXCEPT
    (SELECT city
     FROM empl_company k
     WHERE k.company_name = s.company_name
     ) 
);

我成了一个错误 ORA-00907：缺少右括号能告诉我这是什么问题吗？

Answer 1

EXCEPT运算符在Oracle中称为MINUS;

select company_name
from empl_company s
where not exists (
  select city
  from empl_company
  where company_name = 'Small Bank Corporation'
  MINUS
  select city
  from empl_company k
  where k.company_name = s.company_name
);

Answer 2

从emp1_company中选择company_name不存在（从emp1_company中选择city_name ='Small Bank Corporation'和city in（选择city FROM empl_company k WHERE k.company_name = s.company_name））;

如果没有，Oracle缺少括号

2 个答案: