USE [PLAYGROUND]
GO
/****** Object:  Table [dbo].[USER] ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[USER](
    [ID] [int] IDENTITY(1,1) NOT NULL,
    [TYPE__ID] [int] NOT NULL,
    [Enabled] [bit] NOT NULL,
    [Username] [nvarchar](32) NOT NULL,
    [Password] [nchar](32) NOT NULL,
    [Email] [nvarchar](255) NOT NULL,
 CONSTRAINT [PK_USER] 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]

GO
/****** Object:  Table [dbo].[NATURAL_USER] ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATE TABLE [dbo].[NATURAL_USER](
    [ID] [int] NOT NULL,
    [TYPE]  AS ((1)) PERSISTED NOT NULL,
    [BirthDate] [date] NOT NULL,
 CONSTRAINT [PK_NATURAL_USER] 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]

GO
SET ANSI_PADDING OFF
GO
/****** Object:  Table [dbo].[JURIDICAL_USER] ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATE TABLE [dbo].[JURIDICAL_USER](
    [ID] [int] NOT NULL,
    [TYPE]  AS ((2)) PERSISTED NOT NULL,
    [CompanyName] [nvarchar](256) NOT NULL,
    [RegistrationNo] [nvarchar](max) NOT NULL,
    [Description] [nvarchar](max) NOT NULL,
 CONSTRAINT [PK_LEGAL_USER] 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
SET ANSI_PADDING OFF
GO
/****** Object:  Table [dbo].[USER_T] ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[USER_T](
    [ID] [int] IDENTITY(1,1) NOT NULL,
    [TYPE] [nvarchar](32) NOT NULL,
 CONSTRAINT [PK_USER_T] 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]

GO
/****** Object:  Index [IX_USER] ******/
ALTER TABLE [dbo].[USER] ADD  CONSTRAINT [IX_USER] UNIQUE NONCLUSTERED
(
    [Username] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
/****** Object:  Index [PK_USER_TYPE] ******/
CREATE UNIQUE NONCLUSTERED INDEX [PK_USER_TYPE] ON [dbo].[USER]
(
    [ID] ASC,
    [TYPE__ID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
SET ANSI_PADDING ON

GO
/****** Object:  Index [IX_USER_T] ******/
ALTER TABLE [dbo].[USER_T] ADD  CONSTRAINT [IX_USER_T] UNIQUE NONCLUSTERED
(
    [TYPE] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
SET ANSI_PADDING ON

GO
/****** TYPE DATA ******/
SET IDENTITY_INSERT [dbo].[USER_T] ON
GO
INSERT [dbo].[USER_T] ([ID], [TYPE]) VALUES (2, N'JURIDICAL_USER')
GO
INSERT [dbo].[USER_T] ([ID], [TYPE]) VALUES (1, N'NATURAL_USER')
GO
SET IDENTITY_INSERT [dbo].[USER_T] OFF
GO
/****** Contraints ******/
ALTER TABLE [dbo].[JURIDICAL_USER]  WITH CHECK ADD  CONSTRAINT [FK_JURIDICAL_USER___USER] FOREIGN KEY([ID])
REFERENCES [dbo].[USER] ([ID])
GO
ALTER TABLE [dbo].[JURIDICAL_USER] CHECK CONSTRAINT [FK_JURIDICAL_USER___USER]
GO
ALTER TABLE [dbo].[JURIDICAL_USER]  WITH CHECK ADD  CONSTRAINT [FK_JURIDICAL_USER___USER___TYPEVALIDATION] FOREIGN KEY([ID], [TYPE])
REFERENCES [dbo].[USER] ([ID], [TYPE__ID])
GO
ALTER TABLE [dbo].[JURIDICAL_USER] CHECK CONSTRAINT [FK_JURIDICAL_USER___USER___TYPEVALIDATION]
GO
ALTER TABLE [dbo].[NATURAL_USER]  WITH CHECK ADD  CONSTRAINT [FK_NATURAL_USER___USER] FOREIGN KEY([ID])
REFERENCES [dbo].[USER] ([ID])
GO
ALTER TABLE [dbo].[NATURAL_USER] CHECK CONSTRAINT [FK_NATURAL_USER___USER]
GO
ALTER TABLE [dbo].[NATURAL_USER]  WITH CHECK ADD  CONSTRAINT [FK_NATURAL_USER___USER___TYPEVALIDATION] FOREIGN KEY([TYPE])
REFERENCES [dbo].[USER_T] ([ID])
GO
ALTER TABLE [dbo].[NATURAL_USER] CHECK CONSTRAINT [FK_NATURAL_USER___USER___TYPEVALIDATION]
GO
ALTER TABLE [dbo].[USER]  WITH CHECK ADD  CONSTRAINT [FK_USER___USER_T] FOREIGN KEY([TYPE__ID])
REFERENCES [dbo].[USER_T] ([ID])
GO
ALTER TABLE [dbo].[USER] CHECK CONSTRAINT [FK_USER___USER_T]
GO
USE [master]
GO
ALTER DATABASE [PLAYGROUND] SET  READ_WRITE
GO

using (PLAYGROUND model = new PLAYGROUND())
{
    USER user = new USER();
    user.Username = "admin";
    user.Password = "RANDOMHASH#123456";
    user.Email = "admin@example.org";

    user.NATURAL_USER = new NATURAL_USER();
    user.NATURAL_USER.BirthDate = new DateTime(1980, 01, 01);

    model.USER.Add(user);
    model.SaveChanges();
}