我想为所有主行复制详细表中的相关行。
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
并在运行 sql 查询后：
详细表为：
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
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 子句来限制要返回的数据，因为随着表变大，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。
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 | AA 2 | 2 | BB 3 | 3 | 抄送
你可以这样查询：
SELECT detail.* FROM master, detail
</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>
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