Mysql2 ::錯誤：SELECT列表中的表達式＃5不在GROUP BY子句中並且包含非聚集列

Question

我在rails 5應用程序中使用2.4.0 ruby​​寫了這個查詢 我的查詢出現問題，並且mysql拋出以下錯誤：

Mysql2::Error: Expression #5 of SELECT list is not in GROUP BY clause and 
contains nonaggregated column 'order_it.hidden_companies' which is not 
functionally dependent on columns in GROUP BY clause; this is incompatible 
with sql_mode=only_full_group_by: SELECT orders.code as Order_code, 
customers.name as Company_name.... the reste of my query 

查詢：

SELECT 
    orders.code AS Order_code, 
    customers.name AS Company_name, 
    contacts.name AS Name, 
    order_it.code AS Medium_Code, 
    order_it.hidden_companies, 
    GROUP_CONCAT(case when contact_resource_types.code = 'mainphone' then 
     contact_resources.value end SEPARATOR '|') AS Main_phone, 
    GROUP_CONCAT(case when contact_resource_types.code = 'mainfax' then 
     contact_resources.value end SEPARATOR '|') AS Main_fax, 
    GROUP_CONCAT(case when contact_resource_types.code = 'mainemail' then 
     contact_resources.value end SEPARATOR '|') AS Main_email, 
    GROUP_CONCAT(case when contact_resource_types.code = 'mainsite' then 
     contact_resources.value end SEPARATOR '|') AS Main_site, 
    GROUP_CONCAT(case when contact_resource_types.code = 'procell' then 
     contact_resources.value end SEPARATOR '|') AS Pro_cell, 
    GROUP_CONCAT(case when contact_resource_types.code = 'cell' then  
     contact_resources.value end SEPARATOR '|') AS Cell, 
    contact_postal_addresses.street_1 AS Street_1, 
    cities.name AS City, 
    regions.name AS Region 
FROM 
    contacts 
    INNER JOIN contact_postal_addresses 
     ON contact_postal_addresses.contact_id = contacts.id 
    INNER JOIN cities 
     ON cities.id = contact_postal_addresses.city_id 
    INNER JOIN regions 
     ON regions.id = cities.region_id 
    INNER JOIN orders 
     ON order_id = orders.id 
    INNER JOIN contacts AS customers 
     ON customers.id = orders.customer_contact_id 
    INNER JOIN 
    (SELECT DISTINCT 
     order_items.order_id, 
     order_items.hidden_companies, media.code 
    FROM 
     order_items 
     INNER JOIN media 
      ON order_items.medium_id = media.id 
    WHERE 
     media.id = 76 
    ) AS order_it ON order_it.order_id = orders.id 
    LEFT OUTER JOIN contact_resources 
     ON contact_resources.contact_id = contacts.id 
    INNER JOIN contact_resource_types 
     ON contact_resources.contact_resource_type_id = contact_resource_types.id 
WHERE 
    contacts.listing = 1 
    and orders.country_id = 5 
    and orders.order_status_id = 1 
    and contact_resource_types.code in 
     ('mainphone','mainfax','mainemail','mainsite','procell','cell') 
GROUP BY 
    contacts.id 
ORDER BY 
    contacts.updated_at ; 

Answer 1

您應該GROUP BY使用您的SELECT和ORDER BY這是非聚集的，要對所有列安全的一面。 [對所有涉及的表格進行全面定義可能有助於簡化查詢]。

即：

GROUP BY 
    contacts.id 
    ,Order_code 
    ,Company_name 
    ,Name 
    ,Medium_Code 
    ,hidden_companies 
    ,Street_1 
    ,City 
    ,Region 
    ,contacts.updated_at  
ORDER BY 
    contacts.updated_at