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SQL SELECT INTO 语句
2019-10-26 16:28 更新
SQL SELECT INTO 语句
通过 SQL，您可以从一个表复制信息到另一个表。
SELECT INTO 语句从一个表复制数据，然后把数据插入到另一个新表中。
SQL SELECT INTO 语句
SELECT INTO 语句从一个表复制数据，然后把数据插入到另一个新表中。
SQL SELECT INTO 语法
我们可以复制所有的列插入到新表中：
SELECT *
INTO newtable [IN externaldb]
FROM table1;
INTO newtable [IN externaldb]
FROM table1;
或者只复制希望的列插入到新表中：
SELECT column_name(s)
INTO newtable [IN externaldb]
FROM table1;
INTO newtable [IN externaldb]
FROM table1;
 | 提示：新表将会使用 SELECT 语句中定义的列名称和类型进行创建。您可以使用 AS 子句来应用新名称。 |
|---|
SQL SELECT INTO 实例
创建 Customers 的备份复件：
SELECT *
INTO CustomersBackup2013
FROM Customers;
INTO CustomersBackup2013
FROM Customers;
请使用 IN 子句来复制表到另一个数据库中：
SELECT *
INTO CustomersBackup2013 IN 'Backup.mdb'
FROM Customers;
INTO CustomersBackup2013 IN 'Backup.mdb'
FROM Customers;
只复制一些列插入到新表中：
SELECT CustomerName, ContactName
INTO CustomersBackup2013
FROM Customers;
INTO CustomersBackup2013
FROM Customers;
只复制德国的客户插入到新表中：
SELECT *
INTO CustomersBackup2013
FROM Customers
WHERE Country='Germany';
INTO CustomersBackup2013
FROM Customers
WHERE Country='Germany';
复制多个表中的数据插入到新表中：
SELECT Customers.CustomerName, Orders.OrderID
INTO CustomersOrderBackup2013
FROM Customers
LEFT JOIN Orders
ON Customers.CustomerID=Orders.CustomerID;
INTO CustomersOrderBackup2013
FROM Customers
LEFT JOIN Orders
ON Customers.CustomerID=Orders.CustomerID;
提示：SELECT INTO 语句可用于通过另一种模式创建一个新的空表。只需要添加促使查询没有数据返回的 WHERE 子句即可：
SELECT *
INTO newtable
FROM table1
WHERE 1=0;
INTO newtable
FROM table1
WHERE 1=0;
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