Database subject

Solve this pleasy by using Orcal SQL

This is the emp table:

DROP TABLE EMP;

DROP TABLE DEPT;

DROP TABLE SALGRADE;

create table dept(

deptno number(2,0),

dname varchar2(14),

loc varchar2(13),

constraint pk_dept primary key (deptno)

);

INSERT INTO DEPT VALUES (10, 'ACCOUNTING', 'NEW YORK');

INSERT INTO DEPT VALUES (20, 'RESEARCH', 'DALLAS');

INSERT INTO DEPT VALUES (30, 'SALES', 'CHICAGO');

INSERT INTO DEPT VALUES (40, 'OPERATIONS', 'BOSTON');

create table emp(

empno number(4,0),

ename varchar2(10),

job varchar2(9),

mgr number(4,0),

hiredate date,

sal number(7,2),

comm number(7,2),

deptno number(2,0),

constraint pk_emp primary key (empno),

constraint fk_deptno foreign key (deptno) references dept (deptno)

);

INSERT INTO EMP VALUES

(7369, 'SMITH', 'CLERK', 7902,

TO_DATE('17-DEC-1980', 'DD-MON-YYYY'), 800, NULL, 20);

INSERT INTO EMP VALUES

(7499, 'ALLEN', 'SALESMAN', 7698,

TO_DATE('20-FEB-1981', 'DD-MON-YYYY'), 1600, 300, 30);

INSERT INTO EMP VALUES

(7521, 'WARD', 'SALESMAN', 7698,

TO_DATE('22-FEB-1981', 'DD-MON-YYYY'), 1250, 500, 30);

INSERT INTO EMP VALUES

(7566, 'JONES', 'MANAGER', 7839,

TO_DATE('2-APR-1981', 'DD-MON-YYYY'), 2975, NULL, 20);

INSERT INTO EMP VALUES

(7654, 'MARTIN', 'SALESMAN', 7698,

TO_DATE('28-SEP-1981', 'DD-MON-YYYY'), 1250, 1400, 30);

INSERT INTO EMP VALUES

(7698, 'BLAKE', 'MANAGER', 7839,

TO_DATE('1-MAY-1981', 'DD-MON-YYYY'), 2850, NULL, 30);

INSERT INTO EMP VALUES

(7782, 'CLARK', 'MANAGER', 7839,

TO_DATE('9-JUN-1981', 'DD-MON-YYYY'), 2450, NULL, 10);

INSERT INTO EMP VALUES

(7788, 'SCOTT', 'ANALYST', 7566,

TO_DATE('09-DEC-1982', 'DD-MON-YYYY'), 3000, NULL, 20);

INSERT INTO EMP VALUES

(7839, 'KING', 'PRESIDENT', NULL,

TO_DATE('17-NOV-1981', 'DD-MON-YYYY'), 5000, NULL, 10);

INSERT INTO EMP VALUES

(7844, 'TURNER', 'SALESMAN', 7698,

TO_DATE('8-SEP-1981', 'DD-MON-YYYY'), 1500, 0, 30);

INSERT INTO EMP VALUES

(7876, 'ADAMS', 'CLERK', 7788,

TO_DATE('12-JAN-1983', 'DD-MON-YYYY'), 1100, NULL, 20);

INSERT INTO EMP VALUES

(7900, 'JAMES', 'CLERK', 7698,

TO_DATE('3-DEC-1981', 'DD-MON-YYYY'), 950, NULL, 30);

INSERT INTO EMP VALUES

(7902, 'FORD', 'ANALYST', 7566,

TO_DATE('3-DEC-1981', 'DD-MON-YYYY'), 3000, NULL, 20);

INSERT INTO EMP VALUES

(7934, 'MILLER', 'CLERK', 7782,

TO_DATE('23-JAN-1982', 'DD-MON-YYYY'), 1300, NULL, 10);

CREATE TABLE SALGRADE

(GRADE NUMBER,

LOSAL NUMBER,

HISAL NUMBER);

INSERT INTO SALGRADE VALUES (1, 700, 1200);

INSERT INTO SALGRADE VALUES (2, 1201, 1400);

INSERT INTO SALGRADE VALUES (3, 1401, 2000);

INSERT INTO SALGRADE VALUES (4, 2001, 3000);

INSERT INTO SALGRADE VALUES (5, 3001, 9999);

commit;

7. From the Emp table, write a query to find those employees whose salary contains only three digits. Return complete information about the employees. 8. From the Emp table, write a query to find those employees who joined in any year except the month of December. Return complete information about the employees. 9. From the Emp table, write a query to find all those employees who have joined on 1st May, 20th Feb, and 3rd Dec in the year 1981. Return complete information about the employees. 10. From the Emp table, write a query to find those employees working under the managers 7902 or 7698 or 7788 or 7782. Return complete information about the employees 11. From the Emp table, write a query to find those employees who joined in 80's. Return complete information about the employees