Question

我的问题是：
如何构建一个图表，我不了解那么多，或者一对多，关于主键和外键等等。

这是我的代码。是关于我所在的医院：

NURSES，WARD，PATIENTS，DOCTORS。

CREATE TABLE Nurses(
  `idNurses` INT NOT NULL  AUTO_INCREMENT,
  `Fname` VARCHAR(45) NULL,
  `Lname` VARCHAR(45) NULL,
  `Speciality` VARCHAR(45) NULL,
  PRIMARY KEY (`idNurses`))
ENGINE = InnoDB;


CREATE TABLE Doctors (
  `idDoctors` INT NOT NULL  AUTO_INCREMENT,
  `Fname` VARCHAR(45) NULL,
  `Lname` VARCHAR(45) NULL,
  `Speciality` VARCHAR(45) NULL,
  PRIMARY KEY (`idDoctors`))
ENGINE = InnoDB;



CREATE TABLE Ward(
  `idWard` INT NOT NULL  AUTO_INCREMENT,
  `Name` VARCHAR(45) NULL,
  `Location` VARCHAR(45) NULL,
  `Nurses_idNurses` INT NOT NULL,
  `Doctors_idDoctors` INT NOT NULL,
  PRIMARY KEY (`idWard`, `Nurses_idNurses`, `Doctors_idDoctors`),
  INDEX `fk_Ward_Nurses_idx` (`Nurses_idNurses` ASC),
  INDEX `fk_Ward_Doctors1_idx` (`Doctors_idDoctors` ASC),
  CONSTRAINT `fk_Ward_Nurses`
    FOREIGN KEY (`Nurses_idNurses`)
    REFERENCES `mydb`.`Nurses` (`idNurses`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION,
  CONSTRAINT `fk_Ward_Doctors1`
    FOREIGN KEY (`Doctors_idDoctors`)
    REFERENCES `mydb`.`Doctors` (`idDoctors`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION)
ENGINE = InnoDB;

CREATE TABLE Patient (
  `idPatient` INT NOT NULL  AUTO_INCREMENT,
  `Fname` VARCHAR(45) NULL,
  `Lname` VARCHAR(45) NULL,
  `DOB` DATE NULL,
  `Phone_number` INT NULL,
  `Ward_idWard` INT NOT NULL,
  `Ward_Nurses_idNurses` INT NOT NULL,
  `Ward_Doctors_idDoctors` INT NOT NULL,
  PRIMARY KEY (`idPatient`, `Ward_idWard`, `Ward_Nurses_idNurses`, `Ward_Doctors_idDoctors`),
  INDEX `fk_Patient_Ward1_idx` (`Ward_idWard` ASC, `Ward_Nurses_idNurses` ASC, `Ward_Doctors_idDoctors` ASC),![enter image description here][1]
  CONSTRAINT `fk_Patient_Ward1`
    FOREIGN KEY (`Ward_idWard` , `Ward_Nurses_idNurses` , `Ward_Doctors_idDoctors`)
    REFERENCES `mydb`.`Ward` (`idWard` , `Nurses_idNurses` , `Doctors_idDoctors`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION)
ENGINE = InnoDB;

Answer 1

表格之间的关系取决于您想要的设计类型，即您必须决定这一点。

1：病房有多名患者 2：患者有一个病房 3：医生可以让多名护士与他们一起工作，并且可以有多名患者 4：与护士相同，同时分配多个或仅一个病房。

正如您所看到的，这里有许多可能的组合，没有绝对的解决方案。根据您的设计，提出数据库架构。

表之间的mysql关系

1 个答案: