當我選擇列並使用json_build_object時,PostgreSQL 9.5出現問題,我在GROUP BY子句中出現錯誤。使用子查詢時查詢失敗
我有三個表:
Table contact
Colonne | Type
-----------+--------------------------
id | integer
lastname | character varying(255)
firstname | character varying(255)
此表是接觸
Table companie
Colonne | Type
-----------+--------------------------
id | integer
name | character varying(255)
的表此表是公司的表
Table companie_contact
Colonne | Type
-----------+--------------------------
id | integer
id_c | integer
id_cm | integer
此表是多對一多對多的關係來連接與公司的聯繫,反之亦然。
當我執行此查詢的所有作品
SELECT co.id,
json_build_object(
'lastname', co.lastname,
'firstname', co.firstname) AS contact,
array_agg(c.name) AS companies
FROM companie AS c
INNER JOIN companie_contact AS vs
ON c.id = vs.id_cm
INNER JOIN contact AS co
ON co.id = vs.id_c
GROUP BY co.id;
我得到
id | contact | companies
----+----------------------------------------------+-------------
1 | {"lastname" : "some", "firstname" : "one"} | {A,B,D,E,F}
4 | {"lastname" : "some", "firstname" : "two"} | {A}
2 | {"lastname" : "some", "firstname" : "three"} | {B}
但是當我通過查看或子查詢 像下面
-- Imagine that the views are more complex than that
CREATE VIEW view_contact AS SELECT * FROM contact
CREATE VIEW view_companie AS SELECT * FROM companie
SELECT co.id,
json_build_object(
'lastname', co.lastname,
'firstname', co.firstname) AS contact,
array_agg(c.name) AS companies
FROM view_companie AS c
INNER JOIN companie_contact AS vs
ON c.id = vs.id_cm
INNER JOIN view_contact AS co
ON co.id = vs.id_c
GROUP BY co.id;
更換接觸和companie我得到這個錯誤
ERROR: column "co.lastname" must appear in the GROUP BY clause or be used in an aggregate function
LINE 1: SELECT co.id,json_build_object('lastname', co.lastname, 'fi...
我不知道爲什麼我有這樣的錯誤,我沒有找到解決我的特定問題上的Web
感謝您的幫助
PS:對不起,我的英語我法國
你手頭的工作不查詢?這將有助於與錯誤結合使用,但其他人可能已根據給出的事實回答;-) – Dilettant