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Answers for SUB Queries


1. SQL> select empno, ename from emp where deptno=(select deptno from dept where dname='RESEARCH');


2. SQL> select empno, ename from emp where deptno in (select deptno from dept where loc in ('NEW YORK','CHICAGO'));

3. SQL> select dname from dept where deptno in ( select deptno from emp where job ='ANALYST');

4. SQL> select empno, ename, mgr from emp where mgr = (select empno from emp where ename='JONES');

5. SQL> select empno, ename, mgr from emp where mgr = (select mgr from emp where ename='JONES')

6. SQL> select empno, ename, job from emp where deptno in ( select deptno from dept where dname in ('SALES','ACCOUNTING'))

7. SQL> select empno, ename, job from emp where deptno in ( select deptno from dept where dname in ('SALES','RESEARCH')) and empno in (select mgr from emp)

8. SQL> select empno, ename from emp where empno not in ( select mgr from emp where mgr is not null)

9. select empno, ename from emp where empno in (select mgr from emp group by mgr
having count(*) >= 2)

10. SQL> select dname from dept where deptno in (select deptno from emp group by deptno having count(*) >=5)

11. SQL> select deptno, job, count(*) from emp where job = 'SALESMAN' group by deptno, job having count(*) >=3


12. SQL> select empno, ename, deptno from emp where empno in (select mgr from emp group by mgr
having count(*) >= 2) and deptno in (select deptno from dept where dname='RESEARCH' or dname='ACCOUNTING')

13. SQL>select max(sal) from emp where sal < (select max(sal) from emp);

14. SQL> select max(sal) from emp where sal < (select max(sal) from emp where sal < (select max(sal) from emp where sal < (select max(sal) from emp)))

Comments

Narenddra Reddy.D said…
Can you please post the answers of co-related subqueries?
Jeremia said…
sir, i think the answer to Q-11 should be
select dname from deptwhere deptno in (select deptno from emp where job='SALESMAN' group by deptno,job having count(*)>=3);
NEETISH said…
6 - ANSWER WILL BE LIKE THIS

select * from emp where deptno in ( select deptno from dept where dname in
('SALES','ACCOUNTING') AND JOB = 'MANAGER');
Anonymous said…
Can u plz give the link to download the file.
pravin said…
HI THIS IS PRAVEEN;
I HAV DONE MY GRADUATION, I HAV LEARNT ORACLE SQL AND PL/SQL .I NEED SOME QUESTIONS AND ANWERS .I HOPE SO WITH UR HELP I CAN CRACK THE INTERVIEW.
List all the employees whose salaries are greater than their respective departmental average salary?
ANS:
#####
select * from emp e where sal>(select avg(sal) from emp d where d.deptno=e.deptno);
OR

SELECT empno, ename, deptno
FROM emp e
WHERE sal > (SELECT AVG(sal)
FROM emp e1
WHERE e1.deptno = e.deptno
GROUP BY deptno)
pl/sql que and ans......plz upload
14. SQL> select max(sal) from emp where sal < (select max(sal) from emp where sal < (select max(sal) from emp where sal < (select max(sal) from emp)))
......could tell me sir easy short cut query.....

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SQL Interview Questions on Subqueries

SUB Queries:
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3. Display the department name in which ANALYSTS are working
4. Display employees who are reporting to JONES
5. Display all the employees who are reporting to Jones Manager
6. Display all the managers in SALES and ACCOUNTING department
7. Display all the employee names in Research and Sales Department who are having at least 1 person reporting to them
8. Display all employees who do not have any reportees
9. List employees who are having at least 2 reporting
10. List the department names which are having more than 5 employees
11. List department name having at-least 3 salesman
12. List employees from research and accounting having at-least 2 reporting
13. Display second max salary
14. Display 4th max salary
15. Display 5th max salary  -- Answer for nth Max Salary
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16. Write a query to get 4th max salary from EMP table
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'Linux-x86_64 Error: 28: No space left on device' While trying to start the database -- Error

SQL> startup mount pfile='/tmp/initdlfasp12.ora'
ORA-27102: out of memory
Linux-x86_64 Error: 28: No space left on device


This as you can see is on Linux x86 with 64 bit processor. We got this error after we changed SGA on 10gR2 database. So was sure that this is something to do with the OS.

Parameters to check for this are shmall.

shmall is the total amount of shared memory, in pages, that the system can use at one time.

$cat /proc/sys/kernel/shmmax
53687091200

$ getconf PAGE_SIZE
4096

As per Oracle SHMALL should be set to the total amount of physical RAM divided by page size.

Our system has 64GB memory, so change kernel.shmall = 1024 * 1024 * 1024 * 64 / 4096 = 16777216


Once this value is calculated you can modify Linux system configuration file directly.

$ su - root
vi /etc/sysctl.conf file:
kernel.shmall=16777216

and

# sysctl -p

Once this is done the database was started without any problem.