SQL INSERT INTO SELECT 语句
SQL INSERT INTO SELECT 语句
该 INSERT INTO SELECT
语句将数据从一个表复制到另一个表。
该 INSERT INTO SELECT
语句要求源表和目标表的数据类型匹配。
注意: 目标表中的现有记录不受影响。
INSERT INTO SELECT 语法
将一个表的所有列复制到另一个表
INSERT INTO table2
SELECT * FROM table1
WHERE condition;
将一个表中的一些列复制到另一个表
INSERT INTO table2 (column1, column2, column3, ...)
SELECT column1, column2, column3, ...
FROM table1
WHERE condition;
演示数据库
在本教程中,我们将使用著名的 Northwind 示例数据库。
以下是“Customers”表中的一个选择
CustomerID | CustomerName | ContactName | Address | City | PostalCode | Country |
---|---|---|---|---|---|---|
1 |
Alfreds Futterkiste | Maria Anders | Obere Str. 57 | Berlin | 12209 | Germany |
2 | Ana Trujillo Emparedados y helados | Ana Trujillo | Avda. de la Constitución 2222 | México D.F. | 05021 | Mexico |
3 | Antonio Moreno Taquería | Antonio Moreno | Mataderos 2312 | México D.F. | 05023 | Mexico |
以及“Suppliers”表中的一个选择
SupplierID | SupplierName | ContactName | Address | City | Postal Code | Country |
---|---|---|---|---|---|---|
1 | Exotic Liquid | Charlotte Cooper | 49 Gilbert St. | Londona | EC1 4SD | UK |
2 | New Orleans Cajun Delights | Shelley Burke | P.O. Box 78934 | New Orleans | 70117 | USA |
3 | Grandma Kelly's Homestead | Regina Murphy | 707 Oxford Rd. | Ann Arbor | 48104 | USA |
SQL INSERT INTO SELECT 例子
例子
将“Suppliers”复制到“Customers”(未填充数据的列将包含 NULL)
INSERT INTO Customers (CustomerName, City, Country)
SELECT SupplierName, City, Country FROM Suppliers;
例子
将“Suppliers”复制到“Customers”(填充所有列)
INSERT INTO Customers (CustomerName, ContactName, Address, City, PostalCode, Country)
SELECT SupplierName, ContactName, Address, City, PostalCode, Country FROM Suppliers;
例子
仅将德国供应商复制到“Customers”
INSERT INTO Customers (CustomerName, City, Country)
SELECT SupplierName, City, Country FROM Suppliers
WHERE Country='Germany';