There are two possible approaches.
- Check constraints - @mh2017 has explained this well in his answer.
Looking at the conversation that seems to fit your requirements better, but just for the sake of sharing idea, I will mention -
- Foreign key constraint (FK)- If it is acceptable to modify the User_Status and User_Role columns to be of type tinyint (or similar number type), you can store just the ids in these and create enumeration (aka mapping tables) to store what the ids represent.
Create FK on User_Status and User_Role in NCT_UserRegistration to refer to the enumeration tables.
FKC ensures that the referring column (User_Status and User_Role in NCT_UserRegistration) cannot have value other than those listed in the referred to column (the respective id columns in the enumeration tables)
This Foreign key vs check constraint for integrity post also describes few benefits of using FK over check constraint
Here is a sample code showing foreign key approach
CREATE TABLE [dbo].[NCT_UserRegistration](
[User_Id] [int] IDENTITY(1,1) NOT NULL,
[User_EmailId] [varchar](255) NULL,
[User_Password] [varchar](512) NULL,
[User_Name] [varchar](255) NULL,
[User_MobileNum] [varchar](20) NULL,
[User_Status] tinyint NULL, -- I changed this from varchar to tinyint
[User_Role] tinyint NULL, -- I changed this from varchar to tinyint
[User_CreatedDate] [timestamp] NULL,
[User_UpdatedDate] [datetime] NULL,
[Name] [varchar](30) NULL
)
create table StatusEnumeration
(
StatusId tinyint,
Description varchar(10)
constraint pk_StatusEnumeration__StatusId primary key clustered (StatusId)
)
insert into StatusEnumeration(StatusId, Description)
values
(0, 'Disabled'),
(1, 'Enabled')
create table RoleEnumeration
(
RoleId tinyint,
Description varchar(20)
constraint pk_RoleEnumeration__RoleId primary key clustered (RoleId)
)
insert into RoleEnumeration(RoleId, Description)
values
(0, 'SUPER_ADMIN '),
(1, 'PROJECT_ADMIN')
alter table NCT_UserRegistration
add constraint fk_NCT_UserRegistration__StatusEnumeration_StatusId foreign key (User_Status)
references StatusEnumeration (StatusId)
go
alter table NCT_UserRegistration
add constraint fk_NCT_UserRegistration__RoleEnumeration_RoleId foreign key (User_Role)
references RoleEnumeration (RoleId)
go