SQL Select Into语句

SQL Select Into语句

The SELECT INTO Statement
SELECT INTO 语句

The SELECT INTO statement is most often used to create backup copies of tables or for archiving records.
SELECT INTO语句常用来给数据表建立备份或是历史档案。

Syntax
语法

SELECT column_name(s) INTO newtable [IN externaldatabase] FROM source

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Make a Backup Copy
制作一个备份

The following example makes a backup copy of the "Persons" table:
下面的例子中会为"Persons"表制作一个备份

SELECT * INTO Persons_backupFROM Persons

The IN clause can be used to copy tables into another database:
IN子句可以用来将多个数据表拷贝到另一个数据库上：

SELECT Persons.* INTO Persons IN 'Backup.mdb'FROM Persons

If you only want to copy a few fields, you can do so by listing them after the SELECT statement:
如果你仅仅想拷贝其中的一部分，可以在SELECT后面列举出它们：

SELECT LastName,FirstName INTO Persons_backupFROM Persons

You can also add a WHERE clause. The following example creates a "Persons_backup" table with two columns (FirstName and LastName) by extracting the persons who lives in "Sandnes" from the "Persons" table:
你还可以加上WHERE子句。在下面的举例中会建立一个"Persons_backup"表，里面包含了在"Persons"表中住在"Sandnes"的个人姓(LastName)与名(FirstName)信息。

SELECT LastName,Firstname INTO Persons_backupFROM PersonsWHERE City='Sandnes'

Selecting data from more than one table is also possible. The following example creates a new table "Empl_Ord_backup" that contains data from the two tables Employees and Orders:
选择多个表进行备份也是可以的。下面的举例就建立了一个新的表"Empl_Ord_backup"里面的数据就有Employees和Orders这两张表的内容：

SELECT Employees.Name,Orders.ProductINTO Empl_Ord_backupFROM EmployeesINNER JOIN OrdersON Employees.Employee_ID=Orders.Employee_ID