如何复制所有主记录的相关行

Question

我想在主控的所有行的详细表中复制相关行。

例如：
主表为：

PK   | Data
--------------
1    |  A
2    |  B
3    |  C

明细表为：

PK    | FK     | Data
---------------------
1     | 1      | AA
2     | 1      | BB
3     | 1      | CC

运行 SQL 查询后：
明细表为：

PK    | FK     | Data
---------------------
1     | 1      | AA
2     | 1      | BB
3     | 1      | CC
1     | 2      | AA
2     | 2      | BB
3     | 2      | CC
1     | 3      | AA
2     | 3      | BB
3     | 3      | CC

Answer 1

您在输出中给出的是交叉连接 （http://en.wikipedia.org/wiki/Join_%28SQL%29#Cross_join），通常是"一个坏主意"。

通常，您希望至少有一个 WHERE 子句来限制返回的数据，随着表变大，您将获得的结果将快速增长。返回的行数将是两个表大小的乘积。

Answer 2

我认为您的详细表是这样的（FK数据应该是1,2,3而不是1,1,1）

PK |FK |数据---------------1 |1 |机 管 局2 |2 |BB3 |3 |抄送

您可以像这样查询：

SELECT detail.* FROM master, detail

请参阅此 SQLFiddle

Answer 3

insert into Detail(PK, FK, Data)
select D.PK, C.PK, D.Data
from Detail as D
  cross join (select PK
              from Master as M
              where M.PK <> 1) as C
where D.FK = 1

SE-数据

Answer 4

</pre><code>
Create database:
USE [t]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATE TABLE [dbo].[detail](
    [PK] [int] IDENTITY(1,1) NOT NULL,
    [FK] [int] NULL,
    [Data] [varchar](20) NULL,
 CONSTRAINT [PK_detail] PRIMARY KEY CLUSTERED 
(
    [PK] 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].[detail]  WITH CHECK ADD  CONSTRAINT [FK_detail_master] FOREIGN KEY([FK])
REFERENCES [dbo].[master] ([PK])
GO
ALTER TABLE [dbo].[detail] CHECK CONSTRAINT [FK_detail_master]
GO
//Create master table:
USE [t]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATE TABLE [dbo].[master](
    [PK] [int] IDENTITY(1,1) NOT NULL,
    [Data] [varchar](20) NULL,
 CONSTRAINT [PK_master] PRIMARY KEY CLUSTERED 
(
    [PK] 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

//Create detail table:
USE [t]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
create procedure [dbo].[douplicate]
 @source int,
 @des int
as
begin
insert into dbo.detail(FK,Data)
SELECT     @des,dbo.detail.Data
FROM         dbo.detail INNER JOIN
                      dbo.master ON dbo.detail.FK = dbo.master.PK
where fk=@source                  
end
//Insert values:
insert into master values 
  ('A'),
  ('B'),
 ('C')
insert into detail  values
  (1,'AA'),
  (2,'BB'),
  (3,'CC')
//Create procedure and solotioanswer:
USE [t]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
create procedure [dbo].[douplicate]
 @source int,
 @des int
as
begin
insert into dbo.detail(FK,Data)
SELECT     @des,dbo.detail.Data
FROM         dbo.detail INNER JOIN
                      dbo.master ON dbo.detail.FK = dbo.master.PK
where fk=@source                  
end
</code></pre>