sql - PostgreSQL "relation does not exist" -


i have error:

--------------------------- pgadmin iii --------------------------- error has occurred:  error:  relation "utilizzo" not exist line 1: select costoutilizzo            utilizzo join prenotazi...                                              ^ query:  select costoutilizzo            utilizzo join prenotazione on prenotazione.smartcard=utilizzo.smartcard , utilizzo.dataora=prenotazione.dataora smartcard=prenotazione.smartcard , dataora=prenotazione.dataora context:  pl/pgsql function "progettobd1".gestione_riduzione() line 8 @ sql statement --------------------------- ok    ---------------------------

coming function , following trigger

    create function gestione_riduzione() returns trigger $$ declare  costo integer; x integer; y integer; tariffa integer;--i parametri che sto passando sono la chiave di prenotazione e le date su cui devo fare calcoli begin  select costoutilizzo costo utilizzo join prenotazione on prenotazione.smartcard=utilizzo.smartcard , utilizzo.dataora=prenotazione.dataora smartcard=prenotazione.smartcard , dataora=prenotazione.dataora;--qua tiro fuori il costo complessivo su cui aggiungere la penale select valore tariffa tariffa join vettura on vettura.tipo=tariffa.tipo join prenotazione on prenotazione.targa=vettura.targa smartcard=prenotazione.smartcard , dataora=prenotazione.dataora;  x=new.dataritiro-old.dataritiro; y=old.dataconsegna-new.dataconsegna; costo=costo+tariffa*(x+y); update prenotazione  set costoprenotazione=costo smartcard=prenotazione.smartcard , dataora=prenotazione.dataora; end; $$ language plpgsql;       create trigger riduzione before update on prenotazione each row when(((new.dataritiro>=old.dataritiro) , (new.datariconsegna<=old.datariconsegna)) , ((new.datariconsegna-new.dataritiro)!= (old.datariconsegna-old.dataritiro))) execute procedure gestione_riduzione();

the tables i'm using these part of code following:

create table prenotazione (         dataora date,         dataritiro date not null,         datariconsegna date not null,         annullamento boolean default false,         penale integer,         costoprenotazione integer,         smartcard integer references abbonamento(smartcard),          primary key(dataora, smartcard) ,         targa varchar(7) references vettura(targa)     ) create table utilizzo (     dataritiro date,     dataconsegna date not null,     costoutilizzo integer not null,     dataora date,     smartcard integer,     foreign key (dataora,smartcard) references prenotazione(dataora,smartcard),     targa varchar(7) references vettura(targa),     primary key (dataritiro, targa)     )

the error occurs after editing of prenotazione's row, when i'm trying change value of dataritiro or datariconsegna. i'm stuck it, need help. thank in advance.


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