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recupera en una columna el resultado de una consulta de tabla relacionada
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| select x , | |
| (select array_to_json(array_agg(row_to_json(t))) from (select asistentes.apellido as evaluador, evaluacion from evaluadoresxresumen left join asistentes using(idasistente) where idresumen=resumenes.idresumen) t) as evals2 | |
| from xxx |
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para postgresql 9.5 o superior