Question

我创建了一个带有外键值的MySQL表。我想使用MySQL join来获取外键值。我有一个名为employee和外键值sex的表，性别表包含男性＆amp;女。这是我的简单连接查询：

SELECT * FROM sex JOIN employee ON employee.sex_id=sex.id

但我想在这里使用连接查询，但似乎我遗漏了一些东西，请完成此操作：

SELECT employee_id, first_name, last_name, sex_id FROM employee

请告诉我如何在此表的单个查询中insert to forigen key：

CREATE TABLE IF NOT EXISTS `employee` (
  `employee_id` int(11) NOT NULL AUTO_INCREMENT,
  `first_name` varchar(20) NOT NULL,
  `middle_name` varchar(20) DEFAULT NULL,
  `last_name` varchar(20) NOT NULL,
  `employee_employee_id` int(11) DEFAULT NULL,
  `address_id` int(11) DEFAULT NULL,
  `phone_id` int(11) DEFAULT NULL,
  `dob` date DEFAULT NULL,
  `maritial_id` int(11) NOT NULL,
  `sex_id` int(11) NOT NULL,
  PRIMARY KEY (`employee_id`),
  KEY `fk_employee_employee` (`employee_employee_id`),
  KEY `fk_employee_address1` (`address_id`),
  KEY `fk_employee_phone1` (`phone_id`),
  KEY `fk_employee_maritial1` (`maritial_id`),
  KEY `fk_employee_sex1` (`sex_id`)
) ENGINE=InnoDB  DEFAULT CHARSET=utf8 AUTO_INCREMENT=3 ;

我在MySQL中没有好主意

Answer 1

尝试类似：

SELECT e.employee_id, e.first_name, e.last_name, s.id
FROM employee AS e
JOIN sex AS s
ON e.sex_id = s.id

Answer 2

SELECT emp.employee_id, emp.first_name, emp.last_name, emp.sex_id, sx.sex_label 
FROM employee AS emp
JOIN sex AS sx
ON emp.sex_id = sx.id

sex_label是{{1}}表中包含男性或女性的字段名称。

mysql加入，需要建议

2 个答案: