把这个留给像我一样找到这篇文章的谷歌旅行者。
我找到了这个解决方案,它似乎工作得很好,并且不需要任何时髦的模式更改:
https ://dba.stackexchange.com/questions/160210/splitting-data-into-two-tables-in-one-去
他们使用一条MERGE
语句对第一个表(生成要在其他地方使用的标识的表)执行初始插入。它使用该MERGE
语句的原因是因为它允许您使用一个OUTPUT
语句,您可以使用它来输出新的标识值以及源表中的标识值(而不是OUTPUT
在标准INSERT
上使用不允许您输出源表标识)。您可以将此输出数据插入到映射表中,并使用该映射表执行第二次插入。
这是我的解决方案示例代码:
------------------------------------------------------------------------------
------------------------------------------------------------------------------
-- Set up sample schema and data
------------------------------------------------------------------------------
--Source Data
IF OBJECT_ID('dbo.tmp1') IS NOT NULL DROP TABLE dbo.tmp1 --SELECT * FROM dbo.tmp1
CREATE TABLE dbo.tmp1 (tmp1ID INT IDENTITY(1,1), Col1 CHAR(1) NOT NULL, Col2 CHAR(1) NOT NULL, Col3 CHAR(1) NOT NULL, Col4 CHAR(1) NOT NULL, Col5 CHAR(1) NOT NULL, Col6 CHAR(1) NOT NULL)
INSERT INTO dbo.tmp1 (Col1, Col2, Col3, Col4, Col5, Col6)
SELECT x.c1, x.c2, x.c3, x.c4, x.c5, x.c6
FROM (VALUES ('A','B','C','D','E','F'),
('G','H','I','J','K','L'),
('M','N','O','P','Q','R')
) x(c1,c2,c3,c4,c5,c6)
IF OBJECT_ID('dbo.tmp3') IS NOT NULL DROP TABLE dbo.tmp3 --SELECT * FROM dbo.tmp3
IF OBJECT_ID('dbo.tmp2') IS NOT NULL DROP TABLE dbo.tmp2 --SELECT * FROM dbo.tmp2
--Taget tables to split into
CREATE TABLE dbo.tmp2 (
tmp2ID INT IDENTITY(1,1) NOT NULL CONSTRAINT PK_tmp2 PRIMARY KEY CLUSTERED (tmp2ID ASC)
, Col1 CHAR(1) NOT NULL
, Col2 CHAR(1) NOT NULL
, Col3 CHAR(1) NOT NULL
)
CREATE TABLE dbo.tmp3 (
tmp2ID INT NOT NULL
, Col4 CHAR(1) NOT NULL
, Col5 CHAR(1) NOT NULL
, Col6 CHAR(1) NOT NULL
, CONSTRAINT FK_tmp3_tmp2ID FOREIGN KEY(tmp2ID) REFERENCES dbo.tmp2 (tmp2ID)
)
------------------------------------------------------------------------------
------------------------------------------------------------------------------
-- Split data into two tables
------------------------------------------------------------------------------
DECLARE @Mapping TABLE (tmp1ID INT NOT NULL, tmp2ID INT NOT NULL);
--Use merge statment to output the source data PK as well as the newly inserted identity to generate a mapping table
MERGE INTO dbo.tmp2 AS tgt
USING dbo.tmp1 AS src ON (1=0)
WHEN NOT MATCHED THEN
INSERT ( Col1, Col2, Col3)
VALUES (src.Col1, src.Col2, src.Col3)
OUTPUT src.tmp1ID, Inserted.tmp2ID INTO @Mapping (tmp1ID, tmp2ID);
--Use the mapping table to insert the split data into the second table
INSERT INTO dbo.tmp3 (tmp2ID, Col4, Col5, Col6)
SELECT t2.tmp2ID, t1.Col4, t1.Col5, t1.Col6
FROM dbo.tmp2 t2
JOIN @Mapping m ON m.tmp2ID = t2.tmp2ID
JOIN dbo.tmp1 t1 ON t1.tmp1ID = m.tmp1ID
SELECT tmp2ID, Col1, Col2, Col3 FROM dbo.tmp2
SELECT tmp2ID, Col4, Col5, Col6 FROM dbo.tmp3
------------------------------------------------------------------------------
------------------------------------------------------------------------------
-- Clean up
------------------------------------------------------------------------------
DROP TABLE dbo.tmp1
DROP TABLE dbo.tmp3
DROP TABLE dbo.tmp2
------------------------------------------------------------------------------
------------------------------------------------------------------------------
GO