MySQL 教程
/ INSERT SELECT
INSERT SELECT
MySQL INSERT INTO SELECT 語句
INSERT INTO SELECT 語句從一個表中復(fù)制數(shù)據(jù)并將其插入到另一個表中。
INSERT INTO SELECT 語句要求源表和目標(biāo)表中的數(shù)據(jù)類型匹配。
注意:目標(biāo)表中的現(xiàn)有記錄不受影響。
INSERT INTO SELECT 語法
將一個表的所有列復(fù)制到另一個表:
INSERT INTO table2
SELECT * FROM table1WHERE condition;僅將一個表中的一些列復(fù)制到另一個表中:
INSERT INTO table2 (column1, column2, column3, ...)
SELECT column1, column2, column3, ... FROM table1
WHERE condition;
演示數(shù)據(jù)庫
在本教程中，我們將使用著名的 Northwind 示例數(shù)據(jù)庫。
以下是"Customers"表中的選擇:
| 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 |
從"Suppliers"表中選擇:
| 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 |
MySQL INSERT INTO SELECT 示例
以下SQL語句將"Suppliers"復(fù)制到"Customers"（未填充數(shù)據(jù)的列，將包含NULL）:
實(shí)例
INSERT INTO Customers (CustomerName,
City, Country)
SELECT SupplierName, City, Country FROM Suppliers;
以下 SQL 語句將"Suppliers"復(fù)制到"Customers"（填充所有列）:
實(shí)例
INSERT INTO Customers (CustomerName, ContactName, Address, City, PostalCode,
Country)SELECT SupplierName, ContactName, Address, City, PostalCode,
Country FROM Suppliers;
以下 SQL 語句僅將德國供應(yīng)商復(fù)制到"客戶"中:
實(shí)例
INSERT INTO Customers (CustomerName,
City, Country)
SELECT SupplierName, City, Country FROM SuppliersWHERE Country='Germany';