Tables: CREATE TABLE DEPT ( DEPTNO NUMBER(2) CONSTRAINT Pk_Dept PRIMARY KEY, DNA

Question

Tables:

CREATE TABLE DEPT (

DEPTNO              NUMBER(2) CONSTRAINT Pk_Dept PRIMARY KEY,

DNAME               VARCHAR2(14),

LOC                 VARCHAR2(13));

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');

COMMIT;

CREATE TABLE EMP (

EMPNO               NUMBER(4) CONSTRAINT Pk_Emp PRIMARY KEY,

ENAME               VARCHAR2(10),

JOB                 VARCHAR2(9),

MGR                 NUMBER(4) CONSTRAINT EMP_SELF_KEY REFERENCES EMP (EMPNO),

HIREDATE            DATE,

SAL                 NUMBER(7,2),

COMM                NUMBER(7,2),

DEPTNO              NUMBER(2) CONSTRAINT EMP_FOREIGN_KEY REFERENCES DEPT (DEPTNO))

DISABLE CONSTRAINT EMP_SELF_KEY;

INSERT INTO EMP VALUES (7369,'SMITH','CLERK',7902,'17-DEC-1980',800,NULL,20);

INSERT INTO EMP VALUES (7499,'ALLEN','SALESMAN',7698,'20-FEB-1981',1600,300,30);

INSERT INTO EMP VALUES (7521,'WARD','SALESMAN',7698,'22-FEB-1981',1250,500,30);

INSERT INTO EMP VALUES (7566,'JONES','MANAGER',7839,'02-APR-1981',2975,NULL,20);

INSERT INTO EMP VALUES (7654,'MARTIN','SALESMAN',7698,'28-SEP-1981',1250,1400,30);

INSERT INTO EMP VALUES (7698,'BLAKE','MANAGER',7839,'01-MAY-1981',2850,NULL,30);

INSERT INTO EMP VALUES (7782,'CLARK','MANAGER',7839,'09-JUN-1981',2450,NULL,10);

INSERT INTO EMP VALUES (7788,'SCOTT','ANALYST',7566,'09-DEC-1982',3000,NULL,20);

INSERT INTO EMP VALUES (7839,'KING','PRESIDENT',NULL,'17-NOV-1981',5000,NULL,10);

INSERT INTO EMP VALUES (7844,'TURNER','SALESMAN',7698,'08-SEP-1981',1500,0,30);

INSERT INTO EMP VALUES (7876,'ADAMS','CLERK',7788,'12-JAN-1983',1100,NULL,20);

INSERT INTO EMP VALUES (7900,'JAMES','CLERK',7698,'03-DEC-1981',950,NULL,30);

INSERT INTO EMP VALUES (7902,'FORD','ANALYST',7566,'03-DEC-1981',3000,NULL,20);

INSERT INTO EMP VALUES (7934,'MILLER','CLERK',7782,'23-JAN-1982',1300,NULL,10);

COMMIT;

Tasks:

44.

Use subquery to find employees in Department 10 of the same positions as in

department 30

ENAME JOB

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

MILLER CLERK

CLARK MANAGER

45.

Use subquery to find employees in the department 10 that not have  same positions as them in

department 30

ENAME JOB

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

KING PRESIDENT

Explanation / Answer

Tasks: 44

select out_emp.ENAME, out_emp.JOB from EMP out_emp where DEPTNO=10 and exists (select 1 from EMP in_emp where
out_emp.JOB=in_emp.JOB and in_emp.DEPTNO=30);

Tasks: 45
select out_emp.ENAME, out_emp.JOB from EMP out_emp where DEPTNO=10 and not exists (select 1 from EMP in_emp where
out_emp.JOB=in_emp.JOB and in_emp.DEPTNO=30);

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