在运行查询以创建表时遇到错误1064？

Question

我已经创建了客户和产品表。在phpmyadmin中运行以下命令时遇到此错误。
CREATE TABLE orders ( id INT NOT NULL AUTO_INCREMENT, orderNumber INT, productId INT, customerId INT, orderDate DATETIME default CURRENT_TIMESTAMP, PRIMARY KEY(id), PRIMARY KEY (customerId) REFERENCES customers(id) , FOREIGN KEY (productId) REFERENCES products(id) );

1064错误

Answer 1

不能创建多个主键。

试试这个代码。

CREATE TABLE orders (
id INT NOT NULL AUTO_INCREMENT,
orderNumber INT,
productId INT,
customerId INT,
orderDate DATETIME default CURRENT_TIMESTAMP,
PRIMARY KEY(id),
FOREIGN  KEY (customerId) REFERENCES customers(id) ,
FOREIGN KEY (productId) REFERENCES products(id));