How do i truncate the table which has constraints?

SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

CREATE TABLE [dbo].[MYTable](
[ID] [int] IDENTITY(1,1) NOT NULL,
[Text] [nvarchar](max) NOT NULL,
[Type] [int] NOT NULL,
[Alert] [int] NOT NULL
[HasNA] [bit] NOT NULL

CONSTRAINT [PK_MYTable] PRIMARY KEY CLUSTERED
(
[ID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO

ALTER TABLE [dbo].[MYTable] ADD CONSTRAINT [DF_MYTable_Type] DEFAULT ((0)) FOR [Type]
GO

ALTER TABLE [dbo].[MYTable] ADD CONSTRAINT [DF_MYTable_Alert] DEFAULT ((-1)) FOR [Alert]
GO

ALTER TABLE [dbo].[MYTable] ADD CONSTRAINT [DF__MYTable__HasNA__7E37BEF6] DEFAULT ((0)) FOR [HasNA]
GO