Thread: CREATE TABLE with foreign key and primary key
I'm trying to create a table that has three fields as primary key. These
fields must exist in two other tables. id_aluno is primary key in table
pessoa, id_curso and id_polo are primary key in table curso_polo. But it
seems it won't work. What am I doing wrong? See definitions below.
Specifically, I didn't understand:
NOTICE: Illegal FOREIGN KEY definition REFERENCES "curso_polo"
ERROR: number of key attributes in referenced table must be equal to
foreign key
I'm using PostgreSQL 7.0
ufgvirtual=# create table matricula (
ufgvirtual(# id_aluno char(15) references pessoa,
ufgvirtual(# id_curso int4 references curso_polo,
ufgvirtual(# id_polo int2 references curso_polo,
ufgvirtual(# local_prova varchar(50) not null,
ufgvirtual(# autorizado bool default 'f' not null,
ufgvirtual(# id_plano_pgto int2 references plano_pgto not null,
ufgvirtual(# data_matricula date default CURRENT_DATE not null,
ufgvirtual(# primary key(id_aluno,id_curso,id_polo));
NOTICE: CREATE TABLE/PRIMARY KEY will create implicit index
'matricula_pkey' for table 'matricula'
NOTICE: CREATE TABLE will create implicit trigger(s) for FOREIGN KEY
check(s)
NOTICE: Illegal FOREIGN KEY definition REFERENCES "curso_polo"
ERROR: number of key attributes in referenced table must be equal to
foreign key
Table "pessoa" Attribute | Type | Modifier
---------------+----------+-------------------------------------------------login | char(15) | not nullnome
| char(50) | not null
.
.
.
Table "curso_polo" Attribute | Type | Modifier
---------------+----------+----------id_curso | integer | not nullid_polo | smallint | not nullcoordenador
| integer | not nulldata_limite | date |id_plano_pgto | smallint |num_vagas | integer | not null
I have tables pessoa, curso, polo, curso_polo and matricula. Primary key in
curso_polo are id_curso (references curso) and id_polo (references polo). In
table matricula I want as primary key id_pessoa (references pessoa),
id_curso (references curso_polo) and id_polo (references curso_polo).
I hope I have provided enough information. I'm a little confused.
Paulo R. Siqueira
"Paulo Roberto Siqueira" wrote: >ufgvirtual=# create table matricula ( >ufgvirtual(# id_aluno char(15) references pessoa,>ufgvirtual(# id_curso int4 references curso_polo, >ufgvirtual(# id_polo int2 references curso_polo, >ufgvirtual(#local_prova varchar(50) not null, >ufgvirtual(# autorizado bool default 'f' not null, >ufgvirtual(# id_plano_pgtoint2 references plano_pgto not null, >ufgvirtual(# data_matricula date default CURRENT_DATE not null, >ufgvirtual(#primary key(id_aluno,id_curso,id_polo)); ... >I have tables pessoa, curso, polo, curso_polo and matricula. Primary key in >curso_polo are id_curso (references curso)and id_polo (references polo). In >table matricula I want as primary key id_pessoa (references pessoa), >id_curso (referencescurso_polo) and id_polo (references curso_polo). You can't use REFERENCES on a column if the target primary key is made up of more than one column; you have to use a FOREIGN KEY table constraint: create table matricula ( id_aluno char(15) references pessoa, id_curso int4 not null, -- I assume you wantid_polo int2 not null, -- not null here local_prova varchar(50) not null, autorizado bool default 'f'not null, id_plano_pgto int2 references plano_pgto not null, data_matricula date default CURRENT_DATE not null, primarykey(id_aluno,id_curso,id_polo), FOREIGN KEY (id_curso, id_polo REFERENCES curso_polo (id_curso,id_polo)); -- Oliver Elphick Oliver.Elphick@lfix.co.uk Isle of Wight http://www.lfix.co.uk/oliver PGP: 1024R/32B8FAA1: 97 EA 1D 47 72 3F 28 47 6B 7E 39 CC 56 E4 C1 47 GPG: 1024D/3E1D0C1C: CA12 09E0 E8D5 8870 5839 932A 614D 4C34 3E1D 0C1C ======================================== "Delight thyself also in the LORD; and he shall give thee the desires of thineheart." Psalms 37:4