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mySQL error with query SELECT itime, SUBSTRING(itime,1,4) AS Year, SUBSTRING(itime,6,2) AS Month, SUBSTRING(itime,9,2) as Day FROM nccn_nucleus_item WHERE iblog=1 and itime <="2021-06-20 04:21:16" and idraft=0 GROUP BY Year, Month ORDER BY itime DESC: Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'guercioa_nucl318.nccn_nucleus_item.itime' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by