Not able to use GROUP BY with join query in MySQL - mysql

Question

I need to execute the below Query but not able to do it.
SELECT *
FROM (SELECT *
FROM rider_status
order by created_date DESC) as riderActice
INNER JOIN rider_user ON rider_userId = rider_user.id
Where rider_user.isActive = 1
AND online_status = 1
GROUP by rider_userId
Error: "#1055 - Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'riderActice.id' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by"
I have read some blogs and found the below solution.
SET GLOBAL sql_mode=(SELECT REPLACE(##sql_mode,'ONLY_FULL_GROUP_BY',''));
But Yet executing above solution I am getting another issue which is
SET GLOBAL sql_mode=(SELECT REPLACE(##sql_mode,'ONLY_FULL_GROUP_BY',''));
Please let me know if I am missing something or doing it wrong

Answer 1

You can not select all(* means all) columns from a table and do a group by one column. That is why you are getting an error. If the column is in the select clause and it is not a part of aggregate function then it has to be in a group by clause.
Also, use the aliases you have created riderActice when joining two tables(subquery and a table).
Here is a small demo demonstrating first part of my answer.
https://dbfiddle.uk/?rdbms=mysql_8.0&fiddle=b10244e667e59bffb146170014dc69ba
If you want to select all columns then do it like this:
SELECT riderActice.rider_userId
, riderActice.created_date
, rider_user.id
, rider_user.isActive
, rider_user.online_status
FROM rider_status as riderActice
INNER JOIN rider_user ON riderActice.rider_userId = rider_user.id
WHERE rider_user.isActive = 1
AND rider_user.online_status = 1
GROUP BY riderActice.rider_userId
, riderActice.created_date
, rider_user.id
, rider_user.isActive
, rider_user.online_status
If you do not want to group by every column then explain to us what is it that you need, but this is the answer to your question.