在 GROUP BY 子句中包含子查询

Question

我想使用 GROUP BY 聚合下面的 SQL 查询，但我不确定如何将内部 SELECT 包含到我的 GROUP BY 子句中。有没有可能像GROUP BY PEOPLE.NAME, PEOPLE.ADDRESS, CITY 那样做？

SELECT PEOPLE.NAME AS NAME,
 PEOPLE.ADDRESS AS ADDRESS,
 (SELECT PEOPLE.CITY 
  FROM ... 
  WHERE ...) AS CITY
FROM MYSCHEMA.PEOPLE PEOPLE
GROUP BY PEOPLE.NAME, PEOPLE.ADDRESS

Answer 1

使用JOIN:

SELECT p.NAME AS NAME, p.ADDRESS AS ADDRESS, c.CITY 
FROM MYSCHEMA.PEOPLE p LEFT JOIN
     (SELECT . . .
      FROM ... 
      WHERE ...
     ) c
     ON . . . 
GROUP BY p.NAME, p.ADDRESS, c.CITY;