[mysql] #1055 - Expression of SELECT list is not in GROUP BY clause and contains nonaggregated column this is incompatible with sql_mode=only_full_group_by

my Query :

select libelle,credit_initial,disponible_v,sum(montant) as montant 
FROM fiche,annee,type where type.id_type=annee.id_type and annee.id_annee=fiche.id_annee 
and annee = year(current_timestamp) GROUP BY libelle order by libelle asc

• Mysql 5.7.9 runs the query without any problem but mysql 5.7.12 display the error above Could you please help me with that

just go to the window bottom tray click on wamp icon ,click mysql->my.ini,then there is option ;sql-mode="" uncomment this make it like sql-mode="" and restart wamp worked for me

You can disable sql_mode=only_full_group_by by some command you can try this by terminal or MySql IDE

mysql> 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';

mysql> set session sql_mode='STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION';

I have tried this and worked for me. Thanks :)

Solution 1: Remove ONLY_FULL_GROUP_BY from mysql console

mysql > SET GLOBAL sql_mode=(SELECT REPLACE(@@sql_mode,'ONLY_FULL_GROUP_BY',''));

you can read more here

Solution 2: Remove ONLY_FULL_GROUP_BY from phpmyadmin

Open phpmyadmin & select localhost
Click on menu Variables & scroll down for sql mode
Click on edit button to change the values & remove ONLY_FULL_GROUP_BY & click on save. 

You need to specify all of the columns that you're not using for an aggregation function in your GROUP BY clause like this:

select libelle,credit_initial,disponible_v,sum(montant) as montant 
FROM fiche,annee,type where type.id_type=annee.id_type and annee.id_annee=fiche.id_annee 
and annee = year(current_timestamp) GROUP BY libelle,credit_initial,disponible_v order by libelle asc

The full_group_by mode basically makes you write more idiomatic SQL. You can turn off this setting if you'd like. There are different ways to do this that are outlined in the MySQL Documentation. Here's MySQL's definition of what I said above:

MySQL 5.7.5 and up implements detection of functional dependence. If the ONLY_FULL_GROUP_BY SQL mode is enabled (which it is by default), MySQL rejects queries for which the select list, HAVING condition, or ORDER BY list refer to nonaggregated columns that are neither named in the GROUP BY clause nor are functionally dependent on them. (Before 5.7.5, MySQL does not detect functional dependency and ONLY_FULL_GROUP_BY is not enabled by default. For a description of pre-5.7.5 behavior, see the MySQL 5.6 Reference Manual.)

You're getting the error because you're on a version < 5.7.5

This worked for me:

mysql -u root -p
mysql > SET GLOBAL sql_mode=(SELECT REPLACE(@@sql_mode,'ONLY_FULL_GROUP_BY',''));

You might need sudo for the first step:

sudo mysql -u root -p

Base ond defualt config of 5.7.5 ONLY_FULL_GROUP_BY You should use all the not aggregate column in your group by

select libelle,credit_initial,disponible_v,sum(montant) as montant 
FROM fiche,annee,type 
where type.id_type=annee.id_type 
and annee.id_annee=fiche.id_annee 
and annee = year(current_timestamp) 
GROUP BY libelle,credit_initial,disponible_v order by libelle asc

Same thing is happened with 8.0+ versions as well. By default in 8.0+ version it is "enabled" by default. Here is the link official document reference

In case of 5.6+, 5.7+ versions, the property "ONLY_FULL_GROUP_BY" is disabled by default.

To disabled it, follow the same steps suggested by @Miloud BAKTETE

You have to aggregate by anything NOT IN the group by clause.

So,there are two options...Add Credit_Initial and Disponible_v to the group by

OR

Change them to MAX( Credit_Initial ) as Credit_Initial, MAX( Disponible_v ) as Disponible_v if you know the values are constant anyhow and have no other impact.

So let's fully understand, Let's say you have a query which works in localhost but does not in production mode, This is because in MySQL 5.7 and above they decided to activate the sql_mode=only_full_group_by by default, basically it is a strict mode which prevents you to select non aggregated fields.

Here's the query (works in local but not in production mode) :

SELECT post.*, YEAR(created_at) as year
FROM post
GROUP BY year

SELECT post.id, YEAR(created_at) as year  // This will generate an error since there are many ids
FROM post
GROUP BY year

To verify if the sql_mode=only_full_group_by is activated for, you should execute the following query :

SELECT @@sql_mode;   //localhost

Output : IGNORE_SPACE, STRICT_TRANS, ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION (If you don't see it, it means it is deactivated)

But if try in production mode, or somewhere where it gives you the error it should be activated:

SELECT @@sql_mode;   //production

Output: ONLY_FULL_GROUP_BY, STRICT_TRANS_TABLES, NO_ZERO_IN_DATE, NO_ZERO... And it's ONLY_FULL_GROUP_BY we're looking for here.

Otherwise, if you are using phpMyAdmin then go to -> Variables and search for sql_mode

Let's take our previous example and adapt it to it :

SELECT MIN(post.id), YEAR(created_at) as year  //Here we are solving the problem with MIN()
FROM post
GROUP BY year

And the same for MAX()

And if we want all the IDs, we're going to need:

SELECT GROUP_CONCAT(post.id SEPARATOR ','), YEAR(created_at) as year
FROM post
GROUP BY year

or another newly added function:

SELECT ANY_VALUE(post.id), YEAR(created_at) as year 
FROM post
GROUP BY year

?? ANY_VALUE does not exist for MariaDB

And If you want all the fields, then you could use the same:

SELECT ANY_VALUE(post.id), ANY_VALUE(post.slug), ANY_VALUE(post.content) YEAR(created_at) as year 
FROM post
GROUP BY year

? To deactivate the sql_mode=only_full_group_by then you'll need to execute this query:

SET GLOBAL sql_mode=(SELECT REPLACE(@@sql_mode, 'ONLY_FULL_GROUP_BY', ''));

Sorry for the novel, hope it helps.