Error al ejecutar consulta.
SELECT b.* , GROUP_CONCAT( IF(br.blog_id=b.id,br.id,br.blog_id) ) AS blogs_rel FROM blog b LEFT JOIN blog_rel br ON (b.id = br.blog_id OR b.id = br.id) WHERE b.url = "melatonina-que-es"
NULL
In aggregated query without GROUP BY, expression #1 of SELECT list contains nonaggregated column 'normon.b.id'; this is incompatible with sql_mode=only_full_group_by