Scenario: The same product, different models, there are different prices, such as 1 mobile phone has 128G, 2,256g, 2500 yuan, but the product display page, the price shows 2,000 yuan, if it is a product, no The method is displayed, the method used here is to query the average price of the same ID, compare the first price, if different, return 0, the same returns 1, through 0, 1, let the front end to determine.

SQL: Use the AVG function to query the average price, compare 0 or 1 with the first Price, but report error
Because after mysql5.7.5, the default SQL configuration above Mysql 5.7.5 is: SQL_Mode = "Only_Full_Group_by", this configuration strictly implements "SQL92 Standard". Therefore, some SQL before the previous SQL could not be executed normally. In fact, it is caused by our SQL irregular, because some of the data returned after the groupbook, so this error will occur.

When SQL is executed, this cause, simply:
Due to the setting of the ONLY_FULL_GROUP_BY, if the SELECT field is not in Group By,
And the field of SELECT does not use the aggregate function (SUM, AVG, MIN, MIN, etc.), then this SQL query is illegal by mysql, will be reported.

ONLY_FULL_GROUP_BY This model features

1: As long as there is a function of aggregate functions, count (), max (), avg (), etc., you will need to use Group By, otherwise the above error will be reported.

2: GROUP BY ID (ID is the primary key), SELECT has no problem, including the polymer function

3: When the group by role (non-primary key), SELECT can only be a polymeric function and role (Group By field), otherwise error

There are two solutions:
First, modify the mysql configuration file:
Find my mysql installation directory, open the My.ini file directly with Notepad
Edit the My.cnf file, add content under the [MySQL] tab

sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION

Restart the MySQL service

Second, modify the SQL statement:
Using a function any_value () contains an error field

SELECT ANY_VALUE(avg( price )= price) FROM pms_sku_stock ss WHERE ss.product_id =27

Any_Value () function description:

mysql has an ANY_VALUE (FIELD) function, its main role is to suppress the only_full_group_by value being rejected. Such a SQL statement is in the ONLY_FULL_GROUP_BY mode, and it can be performed normally in the open mode, and is not rejected by MySQL. Any_Value () will select the specified column value of the first data in the data being divided into the same group as the return data. Officially has an introduction, address: https://dev.mysql.com/doc/refman/5.7/EN/miscellaneous-functions.html#function_any-view

Reference link:MySQL Error --This IS INCOMPATIBLE with SQL_MODE = ONLY_FULL_GROUP_BY Perfect Solution