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未登录前: MySQL程序项具以下两种通用形式:
长项,由单词之前加两个减号组成 短项,由单个字母之前加一个减号组成C:\Users\It.me>mysql --versionmysql Ver 14.14 Distrib 5.5.36, for Win32 (x86)C:\Users\It.me>mysql -Vmysql Ver 14.14 Distrib 5.5.36, for Win32 (x86)
登录MySQL后:
mysql> select version();
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| version() | ±----------+ | 5.5.36 | ±----------+ 1 row in set (0.00 sec)第一步:登录mysql数据库管理系统 dos命令窗口: mysql -uroot -p333第二步:查看有哪些数据库 show databases; (这个不是SQL语句,属于MySQL的命令。) +--------------------+ | Database | +--------------------+ | information_schema | | mysql | | performance_schema | | test | +--------------------+第三步:创建属于我们自己的数据库 create database bjpowernode; (这个不是SQL语句,属于MySQL的命令。)第四步:使用bjpowernode数据 use bjpowernode; (这个不是SQL语句,属于MySQL的命令。)第五步:查看当前使用的数据库中有哪些表? show tables; (这个不是SQL语句,属于MySQL的命令。)第六步:初始化数据 mysql> source D:\course\05-MySQL\resources\bjpowernode.sql注意:数据初始化完成之后,有三张表:+-----------------------+| Tables_in_bjpowernode |+-----------------------+| dept || emp || salgrade |+-----------------------+
bjpowernode.sql,这个文件以sql结尾,这样的文件被称为“sql脚本”。
当一个文件的扩展名是.sql,并且该文件中编写了大量的sql语句,我们称这样的文件为sql脚本。 注意:直接使用source命令可以执行sql脚本。 source 脚本地址; sql脚本中的数据量太大的时候,无法打开,请使用source命令完成初始化。drop database bjpowernode;
mysql> desc dept;+--------+-------------+------+-----+---------+-------+| Field | Type | Null | Key | Default | Extra |+--------+-------------+------+-----+---------+-------+| DEPTNO | int(2) | NO | PRI | NULL | | 部门编号| DNAME | varchar(14) | YES | | NULL | | 部门名称| LOC | varchar(13) | YES | | NULL | | 部门位置+--------+-------------+------+-----+---------+-------+mysql> desc emp;+----------+-------------+------+-----+---------+-------+| Field | Type | Null | Key | Default | Extra |+----------+-------------+------+-----+---------+-------+| EMPNO | int(4) | NO | PRI | NULL | | 员工编号| ENAME | varchar(10) | YES | | NULL | | 员工姓名| JOB | varchar(9) | YES | | NULL | | 工作岗位| MGR | int(4) | YES | | NULL | | 上级领导编号| HIREDATE | date | YES | | NULL | | 入职日期| SAL | double(7,2) | YES | | NULL | | 月薪| COMM | double(7,2) | YES | | NULL | | 补助/津贴| DEPTNO | int(2) | YES | | NULL | | 部门编号+----------+-------------+------+-----+---------+-------+mysql> desc salgrade;+-------+---------+------+-----+---------+-------+| Field | Type | Null | Key | Default | Extra |+-------+---------+------+-----+---------+-------+| GRADE | int(11) | YES | | NULL | | 等级| LOSAL | int(11) | YES | | NULL | | 最低薪资| HISAL | int(11) | YES | | NULL | | 最高薪资+-------+---------+------+-----+---------+-------+
mysql> select * from emp;+-------+--------+-----------+------+------------+---------+---------+--------+| EMPNO | ENAME | JOB | MGR | HIREDATE | SAL | COMM | DEPTNO |+-------+--------+-----------+------+------------+---------+---------+--------+| 7369 | SMITH | CLERK | 7902 | 1980-12-17 | 800.00 | NULL | 20 || 7499 | ALLEN | SALESMAN | 7698 | 1981-02-20 | 1600.00 | 300.00 | 30 || 7521 | WARD | SALESMAN | 7698 | 1981-02-22 | 1250.00 | 500.00 | 30 || 7566 | JONES | MANAGER | 7839 | 1981-04-02 | 2975.00 | NULL | 20 || 7654 | MARTIN | SALESMAN | 7698 | 1981-09-28 | 1250.00 | 1400.00 | 30 || 7698 | BLAKE | MANAGER | 7839 | 1981-05-01 | 2850.00 | NULL | 30 || 7782 | CLARK | MANAGER | 7839 | 1981-06-09 | 2450.00 | NULL | 10 || 7788 | SCOTT | ANALYST | 7566 | 1987-04-19 | 3000.00 | NULL | 20 || 7839 | KING | PRESIDENT | NULL | 1981-11-17 | 5000.00 | NULL | 10 || 7844 | TURNER | SALESMAN | 7698 | 1981-09-08 | 1500.00 | 0.00 | 30 || 7876 | ADAMS | CLERK | 7788 | 1987-05-23 | 1100.00 | NULL | 20 || 7900 | JAMES | CLERK | 7698 | 1981-12-03 | 950.00 | NULL | 30 || 7902 | FORD | ANALYST | 7566 | 1981-12-03 | 3000.00 | NULL | 20 || 7934 | MILLER | CLERK | 7782 | 1982-01-23 | 1300.00 | NULL | 10 |+-------+--------+-----------+------+------------+---------+---------+--------+mysql> select * from dept;+--------+------------+----------+| DEPTNO | DNAME | LOC |+--------+------------+----------+| 10 | ACCOUNTING | NEW YORK || 20 | RESEARCH | DALLAS || 30 | SALES | CHICAGO || 40 | OPERATIONS | BOSTON |+--------+------------+----------+mysql> select * from salgrade;+-------+-------+-------+| GRADE | LOSAL | HISAL |+-------+-------+-------+| 1 | 700 | 1200 || 2 | 1201 | 1400 || 3 | 1401 | 2000 || 4 | 2001 | 3000 || 5 | 3001 | 9999 |+-------+-------+-------+
show create table emp;
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