I mean b must equal to c1 in the "other_table" where c2 has a certain value (for example c2 ).
For my first example:
CREATE TABLE parm
( complex varchar(20) NOT NULL, para varchar(50) NOT NULL, sort int4 NOT NULL DEFAULT 10, value varchar(50)
NULL,CONSTRAINTparm_pkey PRIMARY KEY (complex, para, sort)
)
Table user
CREATE TABLE user
( name varchar(20) NOT NULL, type integer NULL
)
In this case "type" of table user must equal to "value" of table "parm" and "para" must be "login_user" (for example)
Regards
Jörg
> -----Ursprüngliche Nachricht-----
> Von: Luca Vernini [mailto:lucazeo@gmail.com]
> Gesendet: Dienstag, 23. September 2014 14:37
> An: Weiss, Jörg
> Cc: pgsql-sql@postgresql.org
> Betreff: Re: [SQL] FOREIGN KEY Reference on multiple columns
>
> Sorry, I don't get your problem.
> In first example there was a where, in second case:
> FOREIGN KEY (b) REFERENCES other_table (c1, c2='c2Value')
> You mean b must be equal to what?
> Try to include real table script.
> Probably you can use a check.
>
> Regards,
>
> Luca.
>
> 2014-09-23 13:38 GMT+02:00 Weiss, Jörg <J.Weiss@dvz-mv.de>:
> >> -----Ursprüngliche Nachricht-----
> >> Von: Luca Vernini [mailto:lucazeo@gmail.com]
> >> Gesendet: Dienstag, 23. September 2014 11:59
> >> An: Weiss, Jörg
> >> Cc: pgsql-sql@postgresql.org
> >> Betreff: Re: [SQL] FOREIGN KEY Reference on multiple columns
> >>
> >> 2014-09-23 11:54 GMT+02:00 Weiss, Jörg <J.Weiss@dvz-mv.de>:
> >> > Hi!
> >> Hi.
> >>
> >> > Is it possible to create a “FOREIGN KEY CONSTRAINT” with references to
> >> > multiple columns of the reference table?
> >>
> >> Yes, it is.
> >>
> >> see here:
> >> http://www.postgresql.org/docs/9.3/static/ddl-constraints.html
> >> Section 5.3.5 there are some examples. One of them has multiple
> >> columns, just like your case.
> >>
> >> > Regards …
> >>
> >> Regards.
> >
> > Thank you!
> >
> > Do you mean this example?
> > CREATE TABLE t1 (
> > a integer PRIMARY KEY,
> > b integer,
> > c integer,
> > FOREIGN KEY (b, c) REFERENCES other_table (c1, c2)
> > );
> > This is not, what I want.
> >
> > In my case it should be something like this:
> > CREATE TABLE t1 (
> > a integer PRIMARY KEY,
> > b integer,
> > c integer,
> > FOREIGN KEY (b) REFERENCES other_table (c1, c2='c2Value')
> > );
> > This example does not work. But I think you can see, what I mean.
> >
> >
> >
> > --
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