一个考生表，现在要随机生成考号,遇到sql疑问，请教各位大虾

一个考生表，现在要随机生成考号

表结构如下：

USE [WZ16]

GO

SET ANSI_NULLS ON

GO

SET QUOTED_IDENTIFIER ON

GO

CREATE TABLE [dbo].[Jwc_Kaosheng](

[KaoshengId] [bigint] IDENTITY(1,1) NOT NULL,

[KaoshiId] [bigint] NOT NULL,

[BanjiStudentId] [bigint] NOT NULL,

[KaoHao] [int] NULL,

[ShiChangNum] [nvarchar](20) COLLATE Chinese_PRC_CI_AS NULL,

[ZuoweiHao] [int] NULL,

[Zongfen] [float] NULL,

[TScore] [float] NULL,

[Dengdi] [nvarchar](10) COLLATE Chinese_PRC_CI_AS NULL,

[ClassMingci] [bigint] NULL,

[ClassMingciAdd] [bigint] NULL,

[SchoolMingci] [bigint] NULL,

[SchoolMingciAdd] [bigint] NULL,

[AllMingci] [bigint] NULL,

[AllMingciAdd] [bigint] NULL,

[Active] [bit] NULL CONSTRAINT [DF_Jwc_Kaosheng_Active] DEFAULT ((1)),

CONSTRAINT [PK__Kaosheng__173876EA] PRIMARY KEY CLUSTERED

(

[KaoshengId] ASC

)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]

) ON [PRIMARY]

GO

EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'考试' ,@level0type=N'SCHEMA', @level0name=N'dbo', @level1type=N'TABLE', @level1name=N'Jwc_Kaosheng', @level2type=N'COLUMN', @level2name=N'KaoshiId'

GO

EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'学生' ,@level0type=N'SCHEMA', @level0name=N'dbo', @level1type=N'TABLE', @level1name=N'Jwc_Kaosheng', @level2type=N'COLUMN', @level2name=N'BanjiStudentId'

GO

EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'考号' ,@level0type=N'SCHEMA', @level0name=N'dbo', @level1type=N'TABLE', @level1name=N'Jwc_Kaosheng', @level2type=N'COLUMN', @level2name=N'KaoHao'

GO

EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'试场号' ,@level0type=N'SCHEMA', @level0name=N'dbo', @level1type=N'TABLE', @level1name=N'Jwc_Kaosheng', @level2type=N'COLUMN', @level2name=N'ShiChangNum'

GO

EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'座位号' ,@level0type=N'SCHEMA', @level0name=N'dbo', @level1type=N'TABLE', @level1name=N'Jwc_Kaosheng', @level2type=N'COLUMN', @level2name=N'ZuoweiHao'

GO

EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'总分' ,@level0type=N'SCHEMA', @level0name=N'dbo', @level1type=N'TABLE', @level1name=N'Jwc_Kaosheng', @level2type=N'COLUMN', @level2name=N'Zongfen'

GO

EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'标准分' ,@level0type=N'SCHEMA', @level0name=N'dbo', @level1type=N'TABLE', @level1name=N'Jwc_Kaosheng', @level2type=N'COLUMN', @level2name=N'TScore'

GO

EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'等第' ,@level0type=N'SCHEMA', @level0name=N'dbo', @level1type=N'TABLE', @level1name=N'Jwc_Kaosheng', @level2type=N'COLUMN', @level2name=N'Dengdi'

GO

EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'班内名次' ,@level0type=N'SCHEMA', @level0name=N'dbo', @level1type=N'TABLE', @level1name=N'Jwc_Kaosheng', @level2type=N'COLUMN', @level2name=N'ClassMingci'

GO

EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'班内进步名次' ,@level0type=N'SCHEMA', @level0name=N'dbo', @level1type=N'TABLE', @level1name=N'Jwc_Kaosheng', @level2type=N'COLUMN', @level2name=N'ClassMingciAdd'

GO

EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'校内名次' ,@level0type=N'SCHEMA', @level0name=N'dbo', @level1type=N'TABLE', @level1name=N'Jwc_Kaosheng', @level2type=N'COLUMN', @level2name=N'SchoolMingci'

GO

EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'校内进步名次' ,@level0type=N'SCHEMA', @level0name=N'dbo', @level1type=N'TABLE', @level1name=N'Jwc_Kaosheng', @level2type=N'COLUMN', @level2name=N'SchoolMingciAdd'

GO

EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'四校名次' ,@level0type=N'SCHEMA', @level0name=N'dbo', @level1type=N'TABLE', @level1name=N'Jwc_Kaosheng', @level2type=N'COLUMN', @level2name=N'AllMingci'

GO

EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'四校进步名次' ,@level0type=N'SCHEMA', @level0name=N'dbo', @level1type=N'TABLE', @level1name=N'Jwc_Kaosheng', @level2type=N'COLUMN', @level2name=N'AllMingciAdd'

GO

EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'参评' ,@level0type=N'SCHEMA', @level0name=N'dbo', @level1type=N'TABLE', @level1name=N'Jwc_Kaosheng', @level2type=N'COLUMN', @level2name=N'Active'

GO

USE [WZ16]

GO

ALTER TABLE [dbo].[Jwc_Kaosheng] WITH CHECK ADD CONSTRAINT [FK_Jwc_Kaosheng_Base_BanjiStudent] FOREIGN KEY([BanjiStudentId])

REFERENCES [dbo].[Base_BanjiStudent] ([BanjiStudentID])

GO

ALTER TABLE [dbo].[Jwc_Kaosheng] WITH CHECK ADD CONSTRAINT [FK_Jwc_Kaosheng_Jwc_Kaoshi] FOREIGN KEY([KaoshiId])

REFERENCES [dbo].[Jwc_Kaoshi] ([KaoshiID])

可以正常运行的SQL:

set ANSI_NULLS ON

set QUOTED_IDENTIFIER ON

go

-- =============================================

-- Author: Name

-- Create date:

-- Description:

-- =============================================

ALTER PROCEDURE [dbo].[RandomKaoHao]

-- Add the parameters for the stored procedure here

@KaoshiId bigint

AS

BEGIN

-- SET NOCOUNT ON added to prevent extra result sets from

-- interfering with SELECT statements.

SET NOCOUNT ON;

-- Insert statements for procedure here

-- declare @KaoshiId bigint

-- set @KaoshiId = 4

;

With VKaosheng as (

select KaoshengId, row_number() over (order by newid() ) as OrderId

from Jwc_Kaosheng where kaoshiId = @KaoshiId

)

update Jwc_Kaosheng

set Jwc_Kaosheng.KaoHao = VKaosheng.OrderId

from Jwc_Kaosheng,VKaosheng

where Jwc_Kaosheng.KaoshengId = VKaosheng.KaoshengId

and Jwc_Kaosheng.kaoshiId = @KaoshiId

-- update Jwc_Kaosheng

-- set Jwc_Kaosheng.KaoHao = (select top 1 OrderId from VKaosheng where Jwc_Kaosheng.KaoshengId = VKaosheng.KaoshengId)

-- where kaoshiId = @KaoshiId

;

--select KaoshengId,KaoHao from Jwc_Kaosheng where kaoshiId = @KaoshiId

END

奇怪处：

下面查询可以正常运行，但做成sp就不行了，考号很多重复。

declare @KaoshiId bigint

set @KaoshiId = 4

;

With VKaosheng as (

select KaoshengId, row_number() over (order by newid() ) as OrderId

from Jwc_Kaosheng where kaoshiId = @KaoshiId

)

-- update Jwc_Kaosheng

-- set Jwc_Kaosheng.KaoHao = VKaosheng.OrderId

-- from Jwc_Kaosheng,VKaosheng

-- where Jwc_Kaosheng.KaoshengId = VKaosheng.KaoshengId

-- and Jwc_Kaosheng.kaoshiId = @KaoshiId

update Jwc_Kaosheng

set Jwc_Kaosheng.KaoHao = (select top 1 OrderId from VKaosheng where Jwc_Kaosheng.KaoshengId = VKaosheng.KaoshengId)

where kaoshiId = @KaoshiId
与上面正常运行的查询，相对就的sp

set ANSI_NULLS ON

set QUOTED_IDENTIFIER ON

go

-- =============================================

-- Author: Name

-- Create date:

-- Description:

-- =============================================

ALTER PROCEDURE [dbo].[RandomKaoHao]

-- Add the parameters for the stored procedure here

@KaoshiId bigint

AS

BEGIN

-- SET NOCOUNT ON added to prevent extra result sets from

-- interfering with SELECT statements.

SET NOCOUNT ON;

-- Insert statements for procedure here

-- declare @KaoshiId bigint

-- set @KaoshiId = 4

;

With VKaosheng as (

select KaoshengId, row_number() over (order by newid() ) as OrderId

from Jwc_Kaosheng where kaoshiId = @KaoshiId

)

-- update Jwc_Kaosheng

-- set Jwc_Kaosheng.KaoHao = VKaosheng.OrderId

-- from Jwc_Kaosheng,VKaosheng

-- where Jwc_Kaosheng.KaoshengId = VKaosheng.KaoshengId

-- and Jwc_Kaosheng.kaoshiId = @KaoshiId

update Jwc_Kaosheng

set Jwc_Kaosheng.KaoHao = (select top 1 OrderId from VKaosheng where Jwc_Kaosheng.KaoshengId = VKaosheng.KaoshengId)

where kaoshiId = @KaoshiId

;

--select KaoshengId,KaoHao from Jwc_Kaosheng where kaoshiId = @KaoshiId

END

为什么，虽然目前已经搞定了错误，但还是不明白原因，有谁知道请赐教。谢谢