Here is the table structure of GV_Voucher for your reference
USE [GVApp]
GO
/****** Object: Table [dbo].[GV_Voucher] Script Date: 05/07/2013 17:32:18 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATE TABLE [dbo].[GV_Voucher](
[VoucherId] [int] IDENTITY(1,1) NOT NULL,
[VoucherTypeId] [int] NOT NULL,
[VoucherNo] [varchar](20) NOT NULL,
[Denomination] [int] NOT NULL,
[ExpiryDate] [datetime] NULL,
[CreatedDate] [date] NULL,
[ModifyDate] [datetime] NULL,
[VoucherStatusId] [int] NOT NULL,
[TransactionID] [varchar](20) NOT NULL,
[Quantity] [int] NOT NULL,
[AmountValue] [int] NULL,
[CreatedBy] [nvarchar](50) NULL,
[ModifiedBy] [nvarchar](50) NULL,
[Validatedays] [int] NULL,
[IsDeleted] [bit] NULL,
CONSTRAINT [PK_GV_Voucher] PRIMARY KEY CLUSTERED
(
[VoucherId] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY],
CONSTRAINT [UN_GVVoucher_VoucherNo] UNIQUE NONCLUSTERED
(
[VoucherNo] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY],
CONSTRAINT [UN_Vocuher_TransactionID] UNIQUE NONCLUSTERED
(
[VoucherNo] ASC,
[TransactionID] 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
ALTER TABLE [dbo].[GV_Voucher] WITH NOCHECK ADD CONSTRAINT [FK_GV_Voucher_GV_VoucherStatus] FOREIGN KEY([VoucherStatusId])
REFERENCES [dbo].[GV_VoucherStatus] ([VoucherStatusId])
GO
ALTER TABLE [dbo].[GV_Voucher] NOCHECK CONSTRAINT [FK_GV_Voucher_GV_VoucherStatus]
GO
ALTER TABLE [dbo].[GV_Voucher] WITH NOCHECK ADD CONSTRAINT [FK_GV_Voucher_GV_VoucherType] FOREIGN KEY([VoucherTypeId])
REFERENCES [dbo].[GV_VoucherType] ([VoucherTypeID])
GO
ALTER TABLE [dbo].[GV_Voucher] NOCHECK CONSTRAINT [FK_GV_Voucher_GV_VoucherType]
GO
ALTER TABLE [dbo].[GV_Voucher] ADD CONSTRAINT [DF_GV_Voucher_CreatedDate] DEFAULT (getdate()) FOR [CreatedDate]
GO
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To get quick answer follow this link:
http://www.sqlservercentral.com/articles/Best+Practices/61537/