On Tue, Mar 27, 2001 at 03:58:39PM +0200, Christian Marschalek wrote:
Pg DOES support it!
Oh... My fault :o)
However, it doesn't really have anything
to do with data redundancy. Data redundancy means storing
the same DATA in more than one table meaning that if it
changes in one table, you have to update all of the other
tables. That's not the same as inheritance which means you
can use a common base_table with additions to child tables as
necessary.
Well we've learned that when you have lets say five tables which all
contain name, adresse, city and so on you also have a form of
redundancy... Can be wrong, though ;o)
there's also this construct -- i don't know the name --
exemplified below by using the table ADDR (very u.s.centric, i
know) as a DATATYPE in table PERSON:
create table addr(
street varchar(30),
city varchar(30),
state char(2),
zip char(5)
);
create table person(
loc addr, -- how about them apples?
phone char(10),
name varchar(30)
);
\d person
Table "person"
Attribute |Type | Modifier
---+-+--
loc | addr|
phone | char(10)|
name | varchar(30) |
the trick, is, how do you insert data into person.addr?
--
It is always hazardous to ask "Why?" in science, but it is often
interesting to do so just the same.
-- Isaac Asimov, 'The Genetic Code'
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