我错了什么？

Question

http://sqlfiddle.com/#!6/30c6fe/4

以下是代码：

    Create table employees
(
  id integer identity(1,1) primary key,
  lastname varchar (16),
  pass_num varchar (16)
 )
;

  insert into employees values ('Ivanov', '11111111');
  insert into employees values ('Ivanov', '11111111');
  insert into employees values ('Ivanov', '55555555');
  insert into employees values ('Petrov', '22222222');
  insert into employees values ('Petrov', '22222222');
  insert into employees values ('Sidorov', '11111111');

SELECT id, lastname, pass_num
FROM employees emp
GROUP BY lastname, pass_num
HAVING min(id);

和 错误：在预期条件的上下文中指定的非布尔类型的表达式，在'）'附近。

Answer 1

上有错误

HAVING min(id);

期待一个表达

样本

HAVING min(id) = 1;

另外，您的GROUP BY不包括所有不在聚合函数中的列。这应该包括列id

GROUP BY lastname, pass_num