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In SQL Server there are two ways to add a column with a default value.
Add Default Value to Existing Column
ALTER TABLE [dbo].[Employees] ADD DEFAULT (getdate()) FOR [DateOfHire]
ALTER TABLE [dbo].[Employees] ADD DEFAULT ((0)) FOR [IsTerminated]
Add New Column with Default Value
ALTER TABLE Employees ADD DateOfHire datetime DEFAULT (GETDATE())
ALTER TABLE Employees ADD IsTerminated datetime DEFAULT (0)
Add Default Value with Create Table
CREATE TABLE [dbo].[Employees]
[EmployeeID] [int] IDENTITY(1,1) NOT NULL,
[FirstName] [varchar](50) NULL,
[LastName] [varchar](50) NULL,
[SSN] [varchar](9) NULL,
[IsTerminated] [bit] NOT NULL DEFAULT ((0)) ,
[DateAdded] [datetime] NULL DEFAULT (getdate()),
[Comments] [varchar](255) NULL,
[DateOfHire] [datetime] NULL