Prospect introduction

There is a long long ago project. As the purchased Alibaba Cloud database expired and no one cares about it, the sad thing happened and the database was released. Nani, I was also a little confused. The manager asked if he could recover. Hey, I don't want to complain, but keep a guard against arrogance and rash ❤ think of a way to solve the problem.
I’m really lucky. Fortunately, there are not many users in that project, otherwise it is really going to be a lightning strike~ Fortunately, I have participated in that project before and there is a local DB.
Since I was not the owner of the previous operation and maintenance, and I did not know the specific database version, I installed an older version:5.7.26

 select version() from dual;
 === > 5.7.26

problem

There is a section of grouping sql. I remember that after the project was completed, there was no problem at all. I restored the database this time and found that it didn't work. emm~~

SELECT
	t1.match_id AS matchId,
	t2.event_id AS eventId,
	t2.logo AS eventLogo,
	t1.match_stauts AS matchStatus,
	t5.status_name AS statusName,
	t1.start_game_time AS startGameTime,
	t1.start_ball_time AS startBallTime,
	t1.flash_flg AS flashFlg,
	t3.name_zh AS homeTeamName,
	t3.logo AS homeTeamLogo,
	t1.home_team_score AS homeTeamScore,
	t4.name_zh AS visitTeamName,
	t4.logo AS visitTeamLogo,
	t1.visit_team_score AS visitTeamScore,
	t2.name_zh AS eventName,
	t2.short_name_zh AS eventShortName
FROM
	app_leisu_matchs t1
LEFT JOIN app_leisu_events t2 ON t1.event_id = t2.event_id
LEFT JOIN app_leisu_teams t3 ON t1.home_team_id = t3.team_id
LEFT JOIN app_leisu_teams t4 ON t1.visit_team_id = t4.team_id
LEFT JOIN app_leisu_match_status t5 ON t1.match_stauts = t5.match_status
LEFT JOIN app_leisu_odds t6 ON t1.match_id = t6.match_id
WHERE
	t1.match_stauts IN (1, 2, 3, 4, 5, 6, 7)
AND FROM_UNIXTIME(
	t1.start_game_time,
	'%Y-%m-%d'
) = DATE_FORMAT(NOW(), '%Y-%m-%d')
GROUP BY
	t1.match_id
ORDER BY
	FIELD(
		t1.match_stauts,
		2,
		3,
		4,
		5,
		6,
		7,
		1
	),
	t1.start_game_time ASC,
	t1.start_ball_time ASC
LIMIT 0, 10

Error report exception:

[Err] 1055 - Expression #5 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'qiuyoule.t5.status_name' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

 Error analysis:
 In fact, it is very clear after the translation, that is, the field taken out by select does not belong to the condition of group by, which violates sql_mode =Is the configuration of only_full_group_by ~  Looking at the sql above, you will find that group by has only one t1.match_id, but there are so many fields in select, hahaha~    Nothing wrong with the report ~

solve

Configure the mysql environment, I think it is related to the version of the database, Baidu checked it, it is indeed
In version 5.7 and above, the default is only_full_group_by

, That is, the select field can only be the field in the group by.
So, I guess, the default environment of this project was 5.6 before~ I want to cry~

Change sql_mode
Method one (data is invalid after restart):
directly take out only_full_group_by

set @@GLOBAL.sql_mode = 'STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION';

If it does not take effect, try restarting the next project~

Note: In this solution, if the database service is restarted, it will be restored to the default only_full_group_by! ! ! Pro test~

Method Two:

Modify the my.ini file
Under the [mysqlld] node,
append

sql_mode='STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION'

Remember to restart the database service~~

Just remove only_full_group_by from the original sql_mode variable!