SQL

CREATE TABLE `users` (
  `CustomerID` int NOT NULL AUTO_INCREMENT,
  `UserName` varchar(50) NOT NULL,
  `passcode` varchar(255) NOT NULL,
  `Email` varchar(100) DEFAULT NULL,
  `Phone` varchar(15) NOT NULL,
  `User_type` enum('customer','employee') NOT NULL,
  PRIMARY KEY (`CustomerID`)
) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;

CREATE TABLE `customers` (
  `CustomerID` int NOT NULL,
  `UserName` varchar(50) NOT NULL,
  `Email` varchar(100) DEFAULT NULL,
  `Phone` varchar(15) DEFAULT NULL,
  PRIMARY KEY (`CustomerID`),
  CONSTRAINT `customers_ibfk_1` FOREIGN KEY (`CustomerID`) REFERENCES `users` (`CustomerID`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;

CREATE TABLE `employee` (
  `CustomerID` int NOT NULL,
  `UserName` varchar(50) NOT NULL,
  `Email` varchar(100) DEFAULT NULL,
  `Phone` varchar(15) DEFAULT NULL,
  PRIMARY KEY (`CustomerID`),
  CONSTRAINT `employee_ibfk_1` FOREIGN KEY (`CustomerID`) REFERENCES `users` (`CustomerID`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;




CREATE TABLE `services` (
  `service_id` int NOT NULL AUTO_INCREMENT,
  `service_name` varchar(100) NOT NULL,
  `duration` int NOT NULL,
  `price` decimal(10,2) NOT NULL,
  PRIMARY KEY (`service_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;

CREATE TABLE `appointments` (
  `id` int NOT NULL AUTO_INCREMENT,
  `booking_number` varchar(50) DEFAULT NULL,
  `customer_id` int DEFAULT NULL,
  `employee_id` int DEFAULT NULL,
  `service_type` varchar(50) DEFAULT NULL,
  `appointment_date` date DEFAULT NULL,
  `appointment_start_time` time DEFAULT NULL,
  `appointment_end_time` time DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `customer_id` (`customer_id`),
  KEY `employee_id` (`employee_id`),
  CONSTRAINT `appointments_ibfk_1` FOREIGN KEY (`customer_id`) REFERENCES `users` (`CustomerID`),
  CONSTRAINT `appointments_ibfk_2` FOREIGN KEY (`employee_id`) REFERENCES `users` (`CustomerID`)
) ENGINE=InnoDB AUTO_INCREMENT=17 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;