有两种方法可以是实现,而且不使用游标.下面两种方法性能远好于游标.
1.INSERT INTO SELECT
这种方法常用在目标表已经存在数据库中.需要从源表把数据插入到目标表的情况.如果目标表和源表的列相同,就不必列出数据列了.
USE AdventureWorks
GO
----Create TestTable
CREATE TABLE TestTable (FirstName VARCHAR(100), LastName VARCHAR(100))
----INSERT INTO TestTable using SELECT
INSERT INTO TestTable (FirstName, LastName)
SELECT FirstName, LastName
FROM Person.Contact
WHERE EmailPromotion = 2
----Verify that Data in TestTable
SELECT FirstName, LastName
FROM TestTable
----Clean Up Database
DROP TABLE TestTable
GO
USE AdventureWorks
GO
----Create TestTable
CREATE TABLE TestTable (FirstName VARCHAR(100), LastName VARCHAR(100))
----INSERT INTO TestTable using SELECT
INSERT INTO TestTable --(FirstName, LastName)
SELECT FirstName, LastName
FROM Person.Contact
WHERE EmailPromotion = 2
----Verify that Data in TestTable
SELECT FirstName, LastName
FROM TestTable
----Clean Up Database
DROP TABLE TestTable
GO
仔细看看有什么区别.
2.SELECT INTO
这种方法用在目标表事先不存在于数据库.在插入数据的同时新建表.新表的字段名和数据类型和需要插入的列相同.
USE AdventureWorks
GO
----Create new table and insert into table using SELECT INSERT
SELECT FirstName, LastName
INTO TestTable
FROM Person.Contact
WHERE EmailPromotion = 2
----Verify that Data in TestTable
SELECT FirstName, LastName
FROM TestTable
----Clean Up Database
DROP TABLE TestTable
GO
我也常用它来复制数据结构,但不插入数据.
USE AdventureWorks
GO
----Create new table and insert into table using SELECT INSERT
SELECT FirstName, LastName
INTO TestTable
FROM Person.Contact
WHERE 1=2
DROP TABLE TestTable
GO 本文转自齐师傅博客园博客，原文链接：http://www.cnblogs.com/youring2/archive/2012/04/06/2434184.html，如需转载请自行联系原作者
