分组时从子查询中计算行数

Question

我需要帮助计算MySQL中子查询中行的结果，我有这样的事情：

SELECT t.Name, 
       t.Person,
       (SELECT COUNT(pp.id) FROM pp JOIN account s ON s.id = pp.account WHERE s.person = t.id HAVING SUM(pp.total) >= (i.total - 250))'Total Accounts', 
FROM (SELECT p.id, n.name 'Name', p.name 'Person' 
      FROM names n 
      JOIN person p ON p.id = n.person) t
      JOIN payInfo i
GROUP BY t.Name

我希望在子查询

中使用GROUP BY得到类似的东西

SELECT t.Name, 
       t.Person,
       (SELECT COUNT(pp.id) FROM pp JOIN account s ON s.id = pp.account WHERE s.person = t.id GROUP BY s.id HAVING SUM(pp.total) >= (i.total - 250))'Total Accounts', 
FROM (SELECT p.id, n.name 'Name', p.name 'Person' 
      FROM names n 
      JOIN person p ON p.id = n.person) t
      JOIN payInfo i
GROUP BY t.Name

我收到此错误：“错误代码：1242。子查询返回超过1行”