Sql server sql server 2008，计数和区分组合在一起

这是我的密码。总共109行

一,

这个代码给了我9行老师的名字

二,

这个密码给了我

column1
  34

问题是如何结合在一起。数一数学生。姓名栏1，教师栏2

我只需要名单和总数。比如,

name     total_student
sam          24
John         35
Julie        34

等等……
我在数学生时遇到了麻烦。它本身是可以的，但是当我使用DISTINCT和COUNT时，它会给我一个错误

我试过了

SELECT COUNT(students.lastname) as Student_total, 
DISTINCT(SELECT top 1 lastname+', '+firstname FROM users 
WHERE privilege not in 
('Counselor','Guardian') AND userindex IN (SELECT userindex FROM studenttouser 
WHERE studentindex = students.studentindex)) AS teacher

---

不起作用。救命啊

您需要使用

Join

和

groupby

。 我不能肯定，除非知道你的表结构和数据库设计，因为这个表似乎有点复杂，因为它需要一个自连接。 你可以在这方面试试

SELECT Name, total_student

FROM
(
SELECT DISTINCT(SELECT top 1 lastname+', '+firstname as Name
FROM users WHERE privilege not in 
   ('Counselor','Guardian') AND userindex IN (SELECT userindex FROM studenttouser 
   WHERE studentindex = students.studentindex))
) teacher

INNER JOIN
(
SELECT COUNT(students.lastname) as total_student
from table 
) as Student 
ON (SELECT top 1 lastname+', '+firstname 
FROM users 
WHERE privilege not in ('Counselor','Guardian') AND userindex IN (SELECT userindex FROM studenttouser 
WHERE studentindex = students.studentindex)
   )=teacher.Name

GROUP BY teacher.Name

SELECT COUNT(students.lastname) as Student_total, 
DISTINCT(SELECT top 1 lastname+', '+firstname FROM users 
WHERE privilege not in 
('Counselor','Guardian') AND userindex IN (SELECT userindex FROM studenttouser 
WHERE studentindex = students.studentindex)) AS teacher

SELECT Name, total_student

FROM
(
SELECT DISTINCT(SELECT top 1 lastname+', '+firstname as Name
FROM users WHERE privilege not in 
   ('Counselor','Guardian') AND userindex IN (SELECT userindex FROM studenttouser 
   WHERE studentindex = students.studentindex))
) teacher

INNER JOIN
(
SELECT COUNT(students.lastname) as total_student
from table 
) as Student 
ON (SELECT top 1 lastname+', '+firstname 
FROM users 
WHERE privilege not in ('Counselor','Guardian') AND userindex IN (SELECT userindex FROM studenttouser 
WHERE studentindex = students.studentindex)
   )=teacher.Name

GROUP BY teacher.Name