A Database Error Occurred

Error Number: 1055

Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'lpa_impresa.ediciones.id' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

SELECT * FROM (`ediciones`) WHERE year(fecha) = '2014' GROUP BY month(fecha)

Filename: /var/www/impresa.laprensaaustral.cl/public_html/models/paginas.php

Line Number: 51