A simple way to Create type ...?

Hi,

I had a look at "create type" docs and it seems somewhat complex, involving
creation of functions and etc. I hope there's a simpler way for the following:

How should one declare a new custom type, say, "AddressType" that corresponds
internally to "varchar(50)". In other words, all columns that are assigned
"AddressType" would internally be "varchar(50)".

Example:
create type AddressType ... -- how to do it in a simple way?

create table ADDRESS
{
address_id int not null,
street_address1 AdressType not null,
street_address2 AdressType not null,
....
)

Thanks

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