写程序create.php，创建数据库companyInfo，在该数据库中建立表department(部门表)，包含字段dId（部门编号，字符串长度为4，主键），字段dName（部门名称，字符串长度为20，不能为空），字段nums（员工人数，整型）。

2、编写程序insert.php，向department表中插入数据，具体的值可参考上一章实训练习。

-To write programs create.php, create a database companyInfo, and department (department table) in the database table that contains the field dId (department number, string length is 4, the primary key), field dName (the name of the department, the length of the string is 20 can not be empty), field nums (number of employees, integer). A 2 program insert.php, to the department table insert data, specific values ​ ​ refer to the above training exercises.