MySQL错误代码1111：无效使用组函数

Question

I get error code 1111 when I try and print the celebrities who do not follow anyone.

user (email, password, name, date_of_birth, address, type)
primary key(email)

celebrity (email, website, kind)
primary key(email)

follow (follower,followee)
primary key(follower,followee)
foreign key(follower) references user(email)
foreign key(followee) references user(email))

SELECT DISTINCT(u.name)
FROM follow as f, user as u, celebrity as c
WHERE u.email = c.email and (0 > COUNT(f.followee))
ORDER by name DESC

Answer 1

you can't use column without aggregation function not mentioned in group

if you want check for an aggregated function result you must use having and not where

so you should use

  SELECT u.name
  FROM follow as f, user as u, celebrity as c
  WHERE u.email = c.email
  GROUP BY  u.names
  having  0 > COUNT(f.followee)

  ORDER by name DESC

(but 0 > COUNT(f.followee) is no sense could be you need another condition for check count , and also your join clause seems not complete)