You're not expressing yourself clearly, because as far as I can understand you there are guaranteed to be no such results.
regards, tom lane
ok,
the output i want is equivalent to:
SELECT CPA.rub_codigo, RUB.rub_descripcion, CPA.cpa_valor, CPA.cpa_fechavencimiento
FROM rec_m_cuadropagos CPA, rec_m_rubro RUB
WHERE RUB.ent_codigo = CPA.ent_codigo AND RUB.rub_codigo = CPA.rub_codigo AND
CPA.ent_codigo = 1 AND CPA.sec_codigo = 1 AND CPA.ani_codigo = '2004-2005' AND
CPA.cic_codigo = 1 AND CPA.esp_codigo = 0 AND CPA.cur_codigo = 1 AND
CPA.cur_paralelo = 'A '
intersect
SELECT CPA.rub_codigo, RUB.rub_descripcion, CPA.cpa_valor, CPA.cpa_fechavencimiento
FROM rec_m_cuadropagos CPA, rec_m_rubro RUB
WHERE RUB.ent_codigo = CPA.ent_codigo AND RUB.rub_codigo = CPA.rub_codigo AND
CPA.ent_codigo = 1 AND CPA.sec_codigo = 1 AND CPA.ani_codigo = '2004-2005' AND
CPA.cic_codigo = 1 AND CPA.esp_codigo = 0 AND CPA.cur_codigo = 1 AND
CPA.cur_paralelo = 'B '
intersect
SELECT CPA.rub_codigo, RUB.rub_descripcion, CPA.cpa_valor, CPA.cpa_fechavencimiento
FROM rec_m_cuadropagos CPA, rec_m_rubro RUB
WHERE RUB.ent_codigo = CPA.ent_codigo AND RUB.rub_codigo = CPA.rub_codigo AND
CPA.ent_codigo = 1 AND CPA.sec_codigo = 1 AND CPA.ani_codigo = '2004-2005' AND
CPA.cic_codigo = 1 AND CPA.esp_codigo = 0 AND CPA.cur_codigo = 1 AND
CPA.cur_paralelo = 'C '
but i cannot use that solution because the columns in wich i want to so such type of query are various and depends on user input
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