如何解决 SELECT 列表不在 GROUP BY 子句中且包含非聚合？

Question

关于此请求，我在 MYSQL 5.7 中收到错误。如何解决此错误？

#1055 - Expression #3 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'test.c.customers_group_id' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

select  SQL_CALC_FOUND_ROWS  c.customers_firstname, 
                             c.customers_lastname, 
                             c.customers_group_id,
                             sum(op.products_quantity * op.final_price) as ordersum 
from customers c,
     orders_products op,
     orders o
where c.customers_id = o.customers_id 
and o.orders_id = op.orders_id 
group by c.customers_firstname, 
         c.customers_lastname 
order by ordersum DESC

Answer 1

在 group by 子句中也包含 c.customers_group_id

Answer 2

您在 GROUP BY 子句中遗漏了 c.customers_group_id。

您可以使用 ANSI JOIN 模式代替 旧式逗号分隔表列表 模式。

以下代码适用于您的情况：

SELECT  SQL_CALC_FOUND_ROWS  c.customers_firstname, 
                             c.customers_lastname, 
                             c.customers_group_id,
                             sum(op.products_quantity * op.final_price) as ordersum 
FROM customers c
JOIN orders o ON o.customers_id = c.customers_id 
JOIN orders_products op ON op.orders_id = o.orders_id
GROUP BY c.customers_firstname, 
         c.customers_lastname,
         c.customers_group_id -- you missed this
ORDER BY ordersum DESC

如何解决 SELECT 列表不在 GROUP BY 子句中且包含非聚合？

How to resolve SELECT list is not in GROUP BY clause and contains nonaggregated?

mysql

mysql-error-1055