> Hi *
> I'm new to SQL, and being in the Linux world, I began with Postgresql.
> One day, I wrote the following :
> - create table person (name text);
> - create table book(name text, author person);
> simple, isn't it ? ;()
> Now :
> - insert into person (name) values ('nicolas');
> INSERT 691704 1
> - insert into person (name) values ('julien');
> INSERT 691705 1
> now, to fill book :
> - insert into book (name, author) values ('my book', 691704);
> INSERT 691706 1
> ok, but cant i write anything but the oid of the person record i want
> insert ? (this is my first question)
Not in that table definition.
> Next :
> insert into book (name,author) values ('other ', 691705);
> INSERT 691707
> OK, right now, i want te get all books written by 'nicolas', i want to
> select * from book where author.name = 'nicolas';
> ERROR: author: Table does not exist.
> select * from book where author = 691706;
> ERROR: There is no operator '=' for types 'person' and 'int4'
> You will either have to retype this query using an explicit
> or you will have to define the operator using CREATE OPERATOR
select * from book
where EXISTS(select person.oid from person
where person.oid = book.author and
person.name = 'nicolas');
select book.* from book, person
where book.author = person.oid and
person.name = 'nicolas';
use the faster one.
> Now my second question : what can i do to get (in a simpler manner)
> all the books written by 'nicolas' ?
> I think that writing an operator just to do that is a little bit
> complicated :-((
> Thank you if someone got the answer .......
> Nicolas Caillaud
pgsql-sql by date
|Next:||From: Nicolas Caillaud||Date: 1998-06-08 21:52:52|
|Subject: Re: [SQL] getting the values of a complex attribute|
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