Table Level Constraints

while inserting record into the table constraints must be satisfied for columns, then Row will insert.

multiple columns come into the condition.

Create table [Admission]

(

      [ID] INT PRIMARY KEY,

      [AdmissionDate] DATE NOT NULL,

      [DischargeDate] DATE NOT NULL,

      [OpearationDate] DATE NOT NULL,

      CONSTRAINT Check_OpearationDate CHECK( [OpearationDate] BETWEEN [AdmissionDate] AND [DischargeDate])

)

Column Level Constraints

while inserting record into the table constraints must be satisfied (only specific to the column), then Row will insert.

only limited to one column.

Default & check constraint are the example of column level constraint.

Create table [Customer]

(

      [ID] INT PRIMARY KEY,

      [FirstName] varchar(10),

      [LastName] varchar(10),

      [DateOfBirth] DATE NOT NULL,

      CONSTRAINT Check_BirthDate CHECK( [DateOfBirth]>'1980-01-01')

)