

--FIRST ADD User_name column--



ALTER TABLE dbo.users
 
ADD user_name varchar(250) NULL


--NEXT ADD THE DATA IN THE User_name column--
UPDATE USERS

SET user_name='DNS   DNS'

Where user_id=1




UPDATE USERS

SET user_name='DNS   DNS'

where user_id=2



UPDATE USERS 

SET user_name='DNS   DNS'

where user_id=3



UPDATE USERS

SET user_name='DNS   DNS'

where user_id=4





UPDATE USERS

SET user_name='DNS   DNS'

where user_id=5

UPDATE USERS

SET user_name='DNS   DNS'

where user_id=6


UPDATE USERS

SET user_name='DNS   DNS'

where user_id=7


UPDATE USERS

SET user_name='DNS   DNS'

where user_id=8


UPDATE USERS

SET user_name='DNS   DNS'

where user_id=9



UPDATE USERS

SET user_name='DNS   DNS'

where user_id=10



UPDATE USERS

SET user_name='DNS   DNS'

where user_id=11


UPDATE USERS

SET user_name='DNS   DNS'

where user_id=12


UPDATE USERS

SET user_name='DNS   DNS'

where user_id=13


UPDATE USERS

SET user_name='DNS   DNS'

where user_id=14


UPDATE USERS

SET user_name='DNS   DNS'

where user_id=15


UPDATE USERS

SET user_name='DNS   DNS'

where user_id=16


UPDATE USERS

SET user_name='DNS   DNS'

where user_id=17


UPDATE USERS

SET user_name='DNS   DNS'

where user_id=18


UPDATE USERS

SET user_name='DNS   DNS'

where user_id=19


UPDATE USERS

SET user_name='DNS   DNS'

where user_id=20

UPDATE USERS

SET user_name='DNS   DNS'

where user_id=21

UPDATE USERS

SET user_name='DNS   DNS'

where user_id=22




--NEXT MAKE IT NOT NULL--

alter table dbo.users

alter column user_name varchar(250) not null

--NEXT MAKE IT UNIQUE--


alter table dbo.users

add constraint unique_user UNIQUE(user_name)
