What is wrong with this query:
WITH volcan AS (SELECT DISTINCT v.numturista
FROM viaje v, sitio s
WHERE v.numsitio = s.numsitio
AND s.tipo = 'Volcan'),
desierto AS (SELECT DISTINCT v.numturista
FROM viaje v, sitio s
WHERE v.numsitio = s.numsitio
AND s.tipo = 'Desierto')
SELECT DISTINCT pais
FROM turista
WHERE numturista IN (volcan INTERSECT desierto);
Isn't it supposed to be equivalent to the following (since WITH creates named SELECT queries):
SELECT DISTINCT pais
FROM turista
WHERE numturista IN (
(SELECT DISTINCT v.numturista
FROM viaje v, sitio s
WHERE v.numsitio = s.numsitio
AND s.tipo = 'Volcan')
INTERSECT
(SELECT DISTINCT v.numturista
FROM viaje v, sitio s
WHERE v.numsitio = s.numsitio
AND s.tipo = 'Desierto')
);
It says:
syntax error near INTERSECT.
Postgres version: psql (PostgreSQL) 9.1.9
UPDATE: Test tables
CREATE TABLE turista (
numturista INTEGER,
nomturista VARCHAR(100),
pais VARCHAR(100),
PRIMARY KEY(numturista)
);
CREATE TABLE sitio (
numsitio INTEGER,
nomsitio VARCHAR(100),
tipo VARCHAR(100),
continente VARCHAR(100),
PRIMARY KEY(numsitio)
);
CREATE TABLE viaje (
numviaje VARCHAR(7),
numturista INTEGER,
numsitio INTEGER,
fechasalida DATE,
fechallegada DATE,
ciudadsalida VARCHAR(100),
PRIMARY KEY(numviaje, numturista, numsitio),
FOREIGN KEY(numsitio) REFERENCES sitio,
FOREIGN KEY(numturista) REFERENCES turista
);
INSERT INTO turista VALUES
(300, 'Carlos', 'Costa Rica')
,(301, 'Pierre', 'Francia')
,(302, 'John', 'Jamaica')
,(303, 'Mario', 'Panama')
,(304, 'Ali', 'Tunez')
,(305, 'Ana', 'Guatemala');
INSERT INTO sitio VALUES
(125, 'Isla Moorea', 'Mar Litoral', 'Oceania')
,(126, 'Bahia Matsushima', 'Mar Litoral', 'Asia')
,(127, 'Irazu', 'Volcan', 'America')
,(128, 'Ngorongoro', 'Volcan', 'Africa')
,(129, 'Valle de la Muerte', 'Desierto', 'America')
,(130, 'Kilimandjar', 'Volcan', 'Africa');
INSERT INTO viaje VALUES
('03-2012', 301, 125, '2013-03-03', '2013-10-03', 'Paris')
,('04-2012', 303, 129, '2013-04-07', '2014-02-07', 'Las Vegas')
,('05-2012', 301, 128, '2013-05-07', '2013-12-07', 'Dar-es-Salam')
,('06-2012', 304, 127, '2013-06-07', '2014-02-07', 'San Jose')
,('07-2012', 302, 128, '2015-04-11', '2014-01-08', 'Mombasa')
,('04-2012', 305, 129, '2013-04-07', '2014-02-07', 'Las Vegas')
,('06-2012', 305, 127, '2013-06-07', '2014-02-07', 'San Jose');