help in solving a problem in sql server

I have aquestions from you. Does SQL server have any features so we can limit a field to fill with just specific values? For example assume that you have a field named "Name" then we want SQL just let us to fill this field with the following values: "Bella", "Jack", "Rose". is 开发者_如何学JAVAthere any featues to do it? please guide me. thanks

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You can use a CHECK constraint:

ALTER TABLE dbo.YOUR_TABLE
ADD CONSTRAINT chk_name CHECK (name IN ('Rose', 'Bella', 'Jack'));

...but you might want to use a separate table & foreign key if you need to add identical CHECK constraints to numerous tables:

NAMES

• name_id (primary key)
• name

Foreign Key Constraint:

ALTER TABLE dbo.YOUR_TABLE
ADD CONSTRAINT fk_names FOREIGN KEY (name)
REFERENCES dbo.NAMES (name_id) ;

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Use Check Constraint