am Thu, dem 20.09.2007, um 14:13:40 +1000 mailte Chester folgendes: > Hi > > I have a question regarding foreign keys, I just cannot get it to create > them for me....I must be doing something wrong but I have no idea what > that might be :) > > I have a table "clients" > > clientID (primary) > ticode > Firstname > SecondName > > I have a second table "titles" > > ticode (primary) > Title > > I am trying to create a foreign key on TIcode "clients" table as in below, > > ALTER TABLE clients ADD CONSTRAINT the_title FOREIGN KEY (ticode) > REFERENCES titles (ticode) ; > > I keep getting this error > > ERROR: insert or update on table "clients" violates foreign key > constraint "the_title" > DETAIL: Key (ticode)=( ) is not present in table "titles". > > Sorry, I have no idea where I am going wrong...Any help would be great
my guess: Table clients, column ticode isn't a INT. It it a TEXT-type and contains an entry ' '. test=> create table clients (clientid serial primary key, ticode text); NOTICE: CREATE TABLE will create implicit sequence "clients_clientid_seq" for serial column "clients.clientid" NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index "clients_pkey" for table "clients" CREATE TABLE test=*> create table titles(ticode text unique, title text); NOTICE: CREATE TABLE / UNIQUE will create implicit index "titles_ticode_key" for table "titles" CREATE TABLE test=*> insert into clients values (1, ' '); INSERT 0 1 test=*> alter table clients add constraint the_title FOREIGN KEY (ticode) REFERENCES titles (ticode); ERROR: insert or update on table "clients" violates foreign key constraint "the_title" DETAIL: Key (ticode)=( ) is not present in table "titles". Andreas -- Andreas Kretschmer Kontakt: Heynitz: 035242/47150, D1: 0160/7141639 (mehr: -> Header) GnuPG-ID: 0x3FFF606C, privat 0x7F4584DA http://wwwkeys.de.pgp.net ---------------------------(end of broadcast)--------------------------- TIP 1: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly
