SQL SELECT INTO 语句
SQL SELECT INTO 语句
SELECT INTO 语句将数据从一个表复制到一个新表中。
SELECT INTO语法
将所有列复制到新表中:
SELECT * INTO newtable [IN externaldb] FROM oldtable WHERE condition;
指定列复制到新表中:
SELECT column1, column2, column3, ... INTO newtable [IN externaldb] FROM oldtable WHERE condition;
将使用旧表中定义的列名和类型创建新表。您可以使用AS子句创建新列名。
SQL SELECT INTO 实例
以下SQL语句创建Customers的备份副本:
SELECT * INTO CustomersBackup2017 FROM Customers;
以下SQL语句使用IN子句将表复制到另一个数据库中的新表中:
SELECT *INTO CustomersBackup2017 IN 'Backup.mdb' FROM Customers;
以下SQL语句指定列复制到新表中:
SELECT CustomerName, ContactName INTO CustomersBackup2017 FROM Customers;
以下SQL语句仅将Germany客户复制到新表中:
SELECT *INTO CustomersGermany FROM Customers WHERE Country = 'Germany';
以下SQL语句将多个表中的数据复制到新表中:
SELECT Customers.CustomerName, Orders.OrderID INTO CustomersOrderBackup2017 FROM Customers LEFT JOIN OrdersON Customers.CustomerID = Orders.CustomerID;
提示: SELECT INTO也可用于使用另一个模式创建一个新的空表。只需添加一个WHERE子句,使查询不返回任何数据:
SELECT * INTO newtable FROM oldtable WHERE 1 = 0;