Report error using group by statement:...this is incompatible with sql_mode=only_full_group_by
Problem background
When using leftjion to connect a table to the left, and the primary and secondary tables are one-to-many, resulting in duplicate data in the result set, in order to remove duplicate data, I intend to use group by to remove duplicate data by grouping. When the following error message appears:
Expression #2 of SELECT list is not in GROUP BY clause and contains nonaggregated
column 'loser.tank_admin.login_ip' which is not functionally dependent on columns in
GROUP BY clause; this is incompatible with sql_mode=only_full_group_by
Through the last sentence we know that using group by is contradictory to sql_mode=only_full_group_by.
Currently you can refer to the following article:
Sql_mode=only_full_group_by study
MySQL 5.7 default ONLY_FULL_GROUP_BY semantic introduction
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