employees库：Departments dept_emp dept_manager employees salaries titles
mysql> select * from departments limit 1;
+---------+------------------+
| dept_no | dept_name
+---------+------------------+
| d009 | Customer Service
+---------+------------------+
mysql> select * from dept_emp limit 1;
+--------+---------+------------+------------+
| emp_no | dept_no | from_date | to_date |
+--------+---------+------------+------------+
| 10001 | d005 | 1986-06-26 | 9999-01-01 |
+--------+---------+------------+------------+
mysql> select * from dept_manager limit 1;
+---------+--------+------------+------------+
| dept_no | emp_no | from_date | to_date |
+---------+--------+------------+------------+
| d001 | 110022 | 1985-01-01 | 1991-10-01 |
+---------+--------+------------+------------+
mysql> select * from employees limit 1;
+--------+------------+------------+-----------+--------+------------+
| emp_no | birth_date | first_name | last_name | gender | hire_date |
+--------+------------+------------+-----------+--------+------------+
| 10001 | 1953-09-02 | Georgi | Facello | M | 1986-06-26 |
+--------+------------+------------+-----------+--------+------------+
mysql> select * from salaries limit 1;
+--------+--------+------------+------------+
| emp_no | salary | from_date | to_date |
+--------+--------+------------+------------+
| 10001 | 60117 | 1986-06-26 | 1987-06-26 |
+--------+--------+------------+------------+
mysql> select * from titles limit 1;
+--------+-----------------+------------+------------+
| emp_no | title | from_date | to_date |
+--------+-----------------+------------+------------+
| 10001 | Senior Engineer | 1986-06-26 | 9999-01-01 |
+--------+-----------------+------------+------------+
Create Table :CREATE TABLE `departments` (
`dept_no` char(4) NOT NULL,
`dept_name` varchar(40) NOT NULL,
PRIMARY KEY (`dept_no`),
UNIQUE KEY `dept_name` (`dept_name`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
Create Table: CREATE TABLE `dept_emp` (
`emp_no` int(11) NOT NULL,
`dept_no` char(4) NOT NULL,
`from_date` date NOT NULL,
`to_date` date NOT NULL,
PRIMARY KEY (`emp_no`,`dept_no`),
KEY `emp_no` (`emp_no`),
KEY `dept_no` (`dept_no`),
CONSTRAINT `dept_emp_ibfk_1` FOREIGN KEY (`emp_no`) REFERENCES `employees` (`emp_no`) ON DELETE CASCADE,
CONSTRAINT `dept_emp_ibfk_2` FOREIGN KEY (`dept_no`) REFERENCES `departments`
(`dept_no`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=latin1
Create Table: CREATE TABLE `dept_manager` (
`dept_no` char(4) NOT NULL,
`emp_no` int(11) NOT NULL,
`from_date` date NOT NULL,
`to_date` date NOT NULL,
PRIMARY KEY (`emp_no`,`dept_no`),
KEY `emp_no` (`emp_no`),
KEY `dept_no` (`dept_no`),
CONSTRAINT `dept_manager_ibfk_1` FOREIGN KEY (`emp_no`) REFERENCES `employees` (`emp_no`) ON DELETE CASCADE,
CONSTRAINT `dept_manager_ibfk_2` FOREIGN KEY (`dept_no`) REFERENCES `departments` (`dept_no`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=latin1
Create Table: CREATE TABLE `employees` (
`emp_no` int(11) NOT NULL,
`birth_date` date NOT NULL,
`first_name` varchar(14) NOT NULL,
`last_name` varchar(16) NOT NULL,
`gender` enum('M','F') NOT NULL,
`hire_date` date NOT NULL,
PRIMARY KEY (`emp_no`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
Create Table: CREATE TABLE `salaries` (
`emp_no` int(11) NOT NULL,
`salary` int(11) NOT NULL,
`from_date` date NOT NULL,
`to_date` date NOT NULL,
PRIMARY KEY (`emp_no`,`from_date`),
KEY `emp_no` (`emp_no`),
CONSTRAINT `salaries_ibfk_1` FOREIGN KEY (`emp_no`) REFERENCES `employees` (`emp_no`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=latin1
Create Table: CREATE TABLE `titles` (
`emp_no` int(11) NOT NULL,
`title` varchar(50) NOT NULL,
`from_date` date NOT NULL,
`to_date` date DEFAULT NULL,
PRIMARY KEY (`emp_no`,`title`,`from_date`),
KEY `emp_no` (`emp_no`),
CONSTRAINT `titles_ibfk_1` FOREIGN KEY (`emp_no`) REFERENCES `employees` (`emp_no`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=latin1