: Use of undefined constant letra - assumed 'letra' (this will throw an Error in a future version of PHP) in
: Use of undefined constant estado_id - assumed 'estado_id' (this will throw an Error in a future version of PHP) in
Expression #2 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'qualific_terms.relaciones.t_relacion' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by
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