Enumeration in plsql.

hi
I want to restrict plsql to be assigned from a certain set of values without if clause here is what i am trying to do
declare
subtype t_char is varchar2(10) in ('valid', 'invalid','obsolete');
l_status t_char
begin
l_status :='valid';
END;
how can i accomplish this
thanks

> I want to restrict plsql to be assigned from a certain set of values without if clause
Yes, it is possible. No, it is not possible.
IMO, PL/SQL is a bit of a mess under the hood. Yes you can create enumerated types in PL/SQL.
SQL> declare
2 huh Fuzzy; -- declared as: type FUZZY is (YES,NO,MAYBE);
3 begin
4 huh := maybe;
5* end;
SQL> /
PL/SQL procedure successfully completed.
However.. the no part. This cannot be done in "normal" PL/SQL code mode. The definition needs to reside the in the STANDARD package of the PL/SQL engine. Which is a terrible idea to hack to create an enumerated type.
The workaround is to create such an enumerated type as a SQL advance (aka user) data type (ADT). I have posted some sample code in [url http://forums.oracle.com/forums/thread.jspa?messageID=2352848]this thread that shows how ADTs can be used to create custom data types - the TBoolean ADT is an example of an enumerated integer type that only accepts 0 and 1.

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