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mysql 第一次作业

employees:

       代码: CREATE TABLE `employees` (
  `id` int NOT NULL,
  `name` varchar(50) NOT NULL,
  `age` int DEFAULT NULL,
  `gender` varchar(10) NOT NULL DEFAULT 'unknown',
  `salary` float DEFAULT NULL,
  PRIMARY KEY (`id`)
);invoices:

        代码: CREATE TABLE `invoices` (
  `number` int NOT NULL AUTO_INCREMENT,
  `order_id` int DEFAULT NULL,
  `in_date` date DEFAULT NULL,
  `total_amount` float DEFAULT NULL,
  PRIMARY KEY (`number`),
  KEY `order_id` (`order_id`),
  CONSTRAINT `invoices_ibfk_1` FOREIGN KEY (`order_id`) REFERENCES `orders` (`id`),
  CONSTRAINT `invoices_chk_1` CHECK ((`total_amount` > 0))
);

orders:

        代码: orders | CREATE TABLE `orders` (
  `id` int NOT NULL,
  `name` varchar(100) NOT NULL,
  `price` float DEFAULT NULL,
  `quantity` int DEFAULT NULL,
  `category` varchar(50) DEFAULT NULL,
  PRIMARY KEY (`id`)
);


原文地址:https://blog.csdn.net/2201_75988692/article/details/140501752

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