Top 35 SQL Interview Question asked in Oracle Apps Technical Interview or SQL TOP 35 Frequently asked question in Technical Interview

Top 35 SQL Interview Question asked in Oracle Apps R12 Technical Interview 

or 

SQL TOP 35 Frequently asked question in Technical Interview 

    

Frequently asked Technical (SQL) question in Oracle apps r12 -:

1.    To find EVEN NUMBER

select * from emp where rowid in (select decode(mod(rownum,2),0,rowid, null) from emp);

2.    To find EVEN NUMBER

select * from emp where rowid in (select decode(mod(rownum,2),0,null ,rowid) from emp);

3.    To find the 5th MAX salary

select distinct sal from emp e1 where 5 = (select count(distinct sal) from emp e2 where e1.sal <= e2.sal);

4.    To find the 9th MIN salary in the emp table.

select distinct sal from emp e1 where 9 = (select count(distinct sal) from emp e2 where e1.sal >= e2.sal);

5.    How can we use Rownum function/How can get output for first 10-row output

select * from emp where rownum <= &Enter_row_num;

6.    How can get output for Last 10-row output

select * from emp minus select * from emp where rownum <= (select count(*) - &Enter_row_num from emp);

7.    Use of Not in, Not Exists and /Department name without allocation of any Employee in it.

select * from dept where deptno not in (select deptno from emp);  

OR

select * from dept a where not exists (select * from emp b where a.deptno = b.deptno);

8.    To find 21 Max salaries?

select distinct sal from emp a where 21 >= (select count(distinct sal) from emp b where a.sal <= b.sal) order by a.sal desc;

9.    To find 11 Min salaries?

select distinct sal from emp a where 11 >= (select count(distinct sal) from emp b  where a.sal >= b.sal);

10.    To find the N^th maximum salary of an employee with a distinct function?

select distinct hiredate from emp a where &n =  (select count(distinct sal) from emp b where a.sal >= b.sal);

11.    Example of Left or right join

select empno,ename,b.deptno,dname from emp a, dept b where a.deptno(+) = b.deptno and empno is null;

select empno,ename,b.deptno,dname from emp a, dept b where a.deptno = b.deptno(+) and empno is null;

12.    To delete duplicate Records from Table 

delete from emp a where rowid != (select max(rowid) from emp b where  a.empno=b.empno);

13.    Use of Group by Function 

select count(EMPNO), b.deptno, dname from emp a, dept b  where a.deptno(+)=b.deptno  group by b.deptno,dname;

14.    Use of Mathematical Function in the query 

select ename,sal/12 as monthlysal from emp;

15.    Select all record "OR" 

select * from emp where deptno=90 or deptno=40;

16.    Select all record Using Less than and greater than.

select * from emp where deptno=40 and sal>1100;

17.    Use of "Not in" by example 

select * from emp where job not in ('SALESMAN','CLERK');

18.    Use of "IN" by example 

select * from emp where empid in('10','20','30');

19.    Select all records where ename starts with 'Sonu' and its length is 8 char.

select * from emp where ename like'Sonu___';

20.    Select all records where ename end with 'Chauhan'/Use of "%"

select * from emp where ename like'%Chauhan';

21.    Use of Count function

select count(MGR),count(sal) from emp;

22.    Use Formula in select 

select ename,(sal+nvl(comm,0)) as totalsal from emp;

23.    Select  any salary <15000 from emp table using a subquery

select * from emp  where sal> any(select sal from emp where sal<15000);

24.    Select  all salary <5000 from emp table using a subquery 

select * from emp  where sal> all(select sal from emp where sal<5000);

25.    Select all the employee group by deptno and sal in descending order.

select ename,deptno,sal from emp order by deptno,sal desc;

26.    How can I create an empty table emp1 with the same structure as emp?

Create table emp1 as select * from emp where 3=5;

27.    How to retrieve record where sal between 3000 to 7000? / Use of "Between"

Select * from emp where sal>=3000 And  sal<7000

28.    Select all records where dept no of both emp and dept table matches.

select * from emp where exists(select * from dept where emp.deptno=dept.deptno)

29.    How to use Union between two table 

(Select * from emp) Union (Select * from emp1)

30.    To find Intersect/Common attribute value 

(Select * from emp) Intersect (Select * from emp1)

31.     Use of "Minus"

(Select * from emp) Minus (Select * from emp1)

32.    Count the total sal deptno wise where more than 2 employees exist.

SELECT  deptno, sum(sal) As totalsal FROM emp GROUP BY deptno HAVING COUNT(empno) > 2

33.    Example of Subquery 

SELECT * FROM   AP_EXPENSE_REPORT_HEADERS_ALL WHERE  EMPLOYEE_ID IN ( SELECT PERSON_ID FROM   PER_ALL_PEOPLE_F WHERE  EMAIL_ADDRESS = &Email_id )

34.    Example of Union 

SELECT PO_HEADER_ID FROM   PO_headers_all 

union 

SELECT PO_HEADER_ID FROM   PO_lines_all

35     Example of Function Like Sum, Avg, etc 

SELECT avg(RATE) from PO_headers_all

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