SqlExceptionHelper:错误：函数计数（字符变化，整数）不存在

我有一个spring应用程序，还有一个本机查询，语法如下：

select  
    COUNT(DISTINCT person.id,(CASE WHEN salary_person.rating = 'Satisfactory' THEN 1 END)) AS totalSatisfactory, 
    COUNT(DISTINCT person.id,(CASE WHEN salary_person.rating = 'Unsatisfactory' THEN 1 END)) AS totalUnsatisfactory
    from person
    join salary_person on person.id = salary_person.person_id;   

我得到一个错误：

 ERROR: function count(character varying, integer) does not exist

---

作为数据库，我使用PostgreSQL。我提到在mysql中，查询是有效的。

Postgres不支持包含多个列的

count（）。但是，您只需使用类似于：
（col\u one，col\u two）
-即匿名记录类型的单个列，即可将两列转换为匿名记录类型的单个列

select COUNT(DISTINCT (person.id,(CASE WHEN salary_person.rating = 'Satisfactory' THEN 1 END))) AS totalSatisfactory, 
       COUNT(DISTINCT (person.id,(CASE WHEN salary_person.rating = 'Unsatisfactory' THEN 1 END))) AS totalUnsatisfactory
from person
  join salary_person on person.id = salary_person.person_id;   

请注意两列周围的括号


然而，在Postgres中，您有一种更优雅的方式来做您想做的事情，通过使用带有
过滤器的条件聚合
子句：

select COUNT(DISTINCT person.id) filter (where salary_person.rating = 'Satisfactory') AS totalSatisfactory, 
       COUNT(DISTINCT person.id) filter (where salary_person.rating = 'Unsatisfactory') AS totalUnsatisfactory
from person
  join salary_person on person.id = salary_person.person_id;