Syntax needed for adding constraints to fields

Question

In Microsoft SQL Server, I want to alter a field to "NOT NULL" AND DEFAULT ''. I've already issued the following two commands:

ALTER TABLE USR ADD Country Varchar(128)
UPDATE USR SET Country=''

Now I need

1. ALTER TABLE USR ADD CONSTRAINT CountryIsNotNull something
2. ALTER TABLE USR ADD CONSTRAINT CountryDefault default ''

Answer 1

You should be able to google it however here is the syntax:

ALTER TABLE USR
ALTER COLUMN Country varchar(128) NOT NULL 
go
ALTER TABLE USR
ADD CONSTRAINT df_usr_conuntry_default DEFAULT '' for Country
go

You could have done the whole thing in one line though with the following:

alter table USR 
add Country varchar(128) not null default '' with values