A Database Error Occurred

Error Number: 1055

Expression #2 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'freegames4rest.games_category.category' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

SELECT `game_id`, `category` FROM (`games_category`) WHERE `game_id` IN ('7_wonders_ancient_alien_makeover', 'angelica_weaver_catch_me_when_you_can', 'midnight_mysteries_haunted_houdini_deluxe', 'pickers', '7_wonders_4_magical_mystery_tour', 'midnight_mysteries_3_devil_on_the_mississippi', 'luxor_hd', 'luxor_5_passage', 'unlikely_suspects', 'the_institute_a_becky_brogan_adventure', 'burger_battle', 'samantha_swift_and_the_fountains_of_youth', 'midnight_mysteries_salem_witch_trials', 'samantha_swift_mystery_from_atlantis', 'luxor_adventures', 'haiku_journey', 'zombie_bowl_o_rama', 'midnight_mysteries_edgar_allan_poe_conspiracy', 'samantha_swift_and_the_golden_touch', '7_wonders_treasures_of_seven', 'samantha_swift_roses_of_athena') GROUP BY `game_id`