如何正确创建SQL表？

Question

我正在尝试使用MySQL Workbench中的以下语法创建一个SQL表（在Mac OS中），

CREATE TABLE orders (

        order_id                    INT NOT NULL PRIMARY KEY, 
        company_id                  INT  NOT NULL, 
        customer_id                 INT NOT NULL, 
        order_number                VARCHAR(200), 
        order_date                  TIMESTAMP NOT NULL, 
        created                     TIMESTAMP NOT NULL, 
        order_status                INT NOT NULL, 

        CONSTRAINT orders_fk_company 
            FOREIGN KEY (company_id) REFERENCES companies (company_id), 

        CONSTRAINT orders_fk_customer 
            FOREIGN KEY (customer_id) REFERENCES customers (customer_id)

    ); 

当我尝试执行此脚本时，我收到以下消息，

Error code: 1067. Invalid default value for 'created'

这里有什么问题以及如何正确创建表格？我有其他2个表，即下面提供的公司和客户。有正确的执行，没有问题。

CREATE TABLE companies (

company_id                  INT     NOT NULL PRIMARY KEY, 
company_name                VARCHAR(50)         NOT NULL, 
contact_name                VARCHAR(50)         NOT NULL, 
contact_phone               VARCHAR(30)         NOT NULL, 
contact_email               VARCHAR(50)         NOT NULL, 
created                     DATETIME            NOT NULL 

);

CREATE TABLE customers (

customer_id                 INT             NOT NULL PRIMARY KEY, 
company_id                  INT                NOT NULL, 
customer_name               VARCHAR(100)        NOT NULL, 
customer_company            VARCHAR(100), 
CONSTRAINT customers_fk_company 
    FOREIGN KEY (company_id) REFERENCES companies (company_id) 

);