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导入一下准备好的文件注意：路径中不要有中文！！
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关于导入的这几张表
mysql> show tables;
+-----------------------+
| Tables_in_bjpowernode |
+-----------------------+
| dept |
| emp |
| salgrade |
+-----------------------+
dept是部门表
emp是员工表
salgrade是工资等级表 -
怎么查看表中的数据：
select * from 表名；//统一执行这个SQL语句
mysql> selectfrom emp;//从emp表查询所有数据
+-------+--------+-----------+------+------------+---------+---------+--------+
| 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> selectfrom 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 |
+-------+-------+-------+ -
不看表中的数据，只看表的结构：
desc + 表名；
mysql> desc dept;
+--------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+--------+-------------+------+-----+---------+-------+
| DEPTNO | int | NO | PRI | NULL | |部门编号
| DNAME | varchar(14) | YES | | NULL | |部门名字
| LOC | varchar(13) | YES | | NULL | |地理位置
+--------+-------------+------+-----+---------+-------+
mysql> desc emp;
+----------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+----------+-------------+------+-----+---------+-------+
| EMPNO | int | 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 | YES | | NULL | |上级编号
| HIREDATE | date | YES | | NULL | |入职日期
| SAL | double(7,2) | YES | | NULL | |工资
| COMM | double(7,2) | YES | | NULL | |补助
| DEPTNO | int | YES | | NULL | |部门编号
+----------+-------------+------+-----+---------+-------+
mysql> desc salgrade;
+-------+------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+------+------+-----+---------+-------+
| GRADE | int | YES | | NULL | |工资等级
| LOSAL | int | YES | | NULL | |最低工资
| HISAL | int | YES | | NULL | |最高工资
+-------+------+------+-----+---------+-------+