课后作业第二章

--课后作业--1SQL> select * from emp;

EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO

----- ---------- --------- ----- ----------- --------- --------- ------

7369 SMITH CLERK 7902 1980-12-17 800.00 20

7499 ALLEN SALESMAN 7698 1981-2-20 1600.00 300.00 30

7521 WARD SALESMAN 7698 1981-2-22 1250.00 500.00 30

7566 JONES MANAGER 7839 1981-4-2 2975.00 20

7654 MARTIN SALESMAN 7698 1981-9-28 1250.00 1400.00 30

7698 BLAKE MANAGER 7839 1981-5-1 2850.00 30

7782 CLARK MANAGER 7839 1981-6-9 2450.00 10

7788 SCOTT ANALYST 7566 1987-4-19 3000.00 20

7839 KING PRESIDENT 1981-11-17 5000.00 10

7844 TURNER SALESMAN 7698 1981-9-8 1500.00 0.00 30

7876 ADAMS CLERK 7788 1987-5-23 1100.00 20

7900 JAMES CLERK 7698 1981-12-3 950.00 30

7902 FORD ANALYST 7566 1981-12-3 3000.00 20 7

934 MILLER CLERK 7782 1982-1-23 1300.00 10

14 rows selected

SQL> select * from dept; DEPTNO DNAME LOC

------ -------------- -------------

10 ACCOUNTING NEW YORK

20 RESEARCH DALLAS

30 SALES CHICAGO

40 OPERATIONS BOSTON

SQL> select * from salgrade; GRADE LOSAL HISAL

---------- ---------- ----------

1 700 1200

2 1201 1400

3 1401 2000

4 2001 3000

5 3001 9999

--2

SQL> desc emp;

Name Type Nullable Default Comments

-------- ------------ -------- ------- --------

EMPNO NUMBER(4)

ENAME VARCHAR2(10) Y

JOB VARCHAR2(9) Y

MGR NUMBER(4) Y

HIREDATE DATE Y

SAL NUMBER(7,2)

Y COMM NUMBER(7,2) Y

DEPTNO NUMBER(2) Y

SQL> desc dept;

Name Type Nullable Default Comments

------ ------------ -------- ------- --------

DEPTNO NUMBER(2)

DNAME VARCHAR2(14) Y

LOC VARCHAR2(13) Y

SQL> desc salgrade;

Name Type Nullable Default Comments

----- ------ -------- ------- --------

GRADE NUMBER Y

LOSAL NUMBER Y

HISAL NUMBER Y