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copied!<p>What about this:</p> <pre><code>SELECT "usuarios"."apellidoPaterno" || ' , ' || "usuarios"."nombres" AS "nomprofesor" FROM "usuarios" WHERE "usuarios"."idUsuario" = ( SELECT "impartidas"."idUsuarioProf" FROM "impartidas", "periodoPlanGrando", "materiasPlan" WHERE "impartidas"."periodo" = "periodoPlanGrado"."periodo" AND "impartidas"."idMateria" = "materiasPlan"."idMateria" ) </code></pre> <p>or maybe</p> <pre><code>SELECT "usuarios"."apellidoPaterno" || ' , ' || "usuarios"."nombres" AS "nomprofesor" FROM "usuarios" WHERE "usuarios"."idUsuario" IN ( SELECT "impartidas"."idUsuarioProf" FROM "impartidas", "periodoPlanGrando", "materiasPlan" WHERE "impartidas"."periodo" = "periodoPlanGrado"."periodo" AND "impartidas"."idMateria" = "materiasPlan"."idMateria" ) </code></pre> <p>if multiple rows might be generated by the subquery (I do not know the schema and my Spanish is not very good (<code>IS NULL</code>) to understand what might be in the <code>"impartidas"</code> table).</p> <p>For code maintenance and readability reasons I would write this:</p> <pre><code>SELECT u.apellidoPaterno || ' , ' || u.nombres AS nomprofesor FROM usuarios u WHERE u.idUsuario = ( SELECT i.idUsuarioProf FROM impartidas i INNER JOIN periodoPlanGrando p USING ( periodo ) INNER JOIN materiasPlan m USING ( idMateria ) -- WHERE (other condifitions) ) </code></pre> <p>or even this:</p> <pre><code>SELECT u.apellido_paterno || ' , ' || u.nombres AS nom_profesor FROM usuarios u WHERE u.id_usuario = ( SELECT i.id_usuario_prof FROM impartidas i INNER JOIN periodo_plan_grado p USING ( periodo ) INNER JOIN materias_plan m USING ( id_materia ) -- WHERE (other condifitions) ) </code></pre> <p>but this would require refractoring table and column names to be more Oracle identifier like.</p>

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