这个INSERT INTO SELECT
语句从一个表复制数据并将其插入到另一表中。
这个INSERT INTO SELECT
语句要求源表和目标表中的数据类型匹配。
笔记:目标表中的现有记录不受影响。
将一个表中的所有列复制到另一表:
INSERT INTO
table2
SELECT * FROM
table1
WHERE
condition;
仅将一个表中的某些列复制到另一个表中:
INSERT INTO
table2 (
column1,
column2,
column3, ...)
SELECT
column1,
column2,
column3, ...
FROM
table1
WHERE
condition;
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 |
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;
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;
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';
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