select-querries out of an array?

Hiho,

I have a question which neither the samples (as far as I was able to
figure out) or the documentation were able to clear up.

I have a table definition like

(btw. why isn't the primary key of the Spiel-class inherited by the
children classes???)

create table Spiel (
Name text not null,
Bestellnummer text not null primary key,
HerstellerID int4 not null,
Erscheinungsdatum datetime,
Preisempfehlung money not null,
Beschreibung text[],
Computertyp text[] not null,
Datentraegertyp text[] not null,
ClueBook text[] );

create table rollenspiel (
Bestellnummer text not null primary key,
System text not null,
AnzahlCharaktere int2 not null,
Typ text not null,
SpielstandEditor text[] ) inherits ( spiel );

create table adventure (
Bestellnummer text not null primary key,
Schwierigkeitsgrad int2 not null ) inherits ( spiel );

create table simulation (
Bestellnummer text not null primary key,
Typ text[] not null,
AnzahlChars int2 not null ) inherits ( spiel );

create table action (
Bestellnummer text not null primary key,
Eingabegeraet text[] not null,
AnzahlSpieler int2 not null ) inherits ( spiel );

with several subclasses which inherit attributes from the parent class.

When I now would like to have all games (Spiel*) selected, which come
on CD as media (Datentraegertyp is array which contains CD, Disks, misc,
etc.), I would type the sql request like this:

select name from Spiel* where Datentraegertyp = '{"CD"}';

which only lists all games which *ONLY* come on CD (pretty clear as the
match is '=' on the single array entry. How do I formulate the request when
I would like to have those which have Datentraegertyp like '{"CD", "Diskette"}'
or '{"Tape", "Diskette", "CD"}' ?

I hope you get what I am up to ;-)

Thanks once again for hints.