Ferruccio Zamuner wrote:
Hi,
I've following select, and I expect to receive a single record as result
from it:
select c.id
from copie as c
where c.enum=46857 and
c.condizio_prestito = 'A' and
c.id not in (select id_copia from testi_fermi_prenotati) and
c.id not in (select id_copia from prestiti);
but it doesn't give me any records at all.
Following there is table descriptions:
CREATE TABLE copie (
id serial NOT NULL primary key,
CREATE TABLE prestiti (
id_copia integer references copie(id)
CREATE TABLE testi_fermi_prenotati (
id_copia integer NOT NULL references copie(id),
Are you sure you don't have any null values in prestiti.id_copia?
--
Richard Huxton
Archonet Ltd
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