INTERVIEW QUESTIONS ORACLE SQL IN ORACLE DETAILS

Question: Display Odd/ Even number of records

Answer: Odd number of records:
select * from emp where (rowid,1) in (select rowid, mod(rownum,2) from emp);
Output:-
1
3
5
Even number of records:
select * from emp where (rowid,0) in (select rowid, mod(rownum,2) from emp)
Output:-
2
4
6

Odd number of records:
select * from emp where (rowid,1) in (select rowid, mod(rownum,2) from emp);
Output:-
1
3
5
Even number of records:
select * from emp where (rowid,0) in (select rowid, mod(rownum,2) from emp)
Output:-
2
4
6 Source: CoolInterview.com

FOR ODD NUMBER OF ROWS

SELECT*FROM emp WHERE rowid IN(SELECT DECODE(MOD(rowid,2),1,rowid,NULL)FROM emp);



FOR EVEN NUMBER OF ROWS
SELECT*FROM emp WHERE rowid IN(SELECT DECODE(MOD(rowid,2),0,rowid,NULL) FROM emp); Source: CoolInterview.com

for even number of records

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

for odd number of records

select*from emp where rowid in(select decode(mod(rownum,2),1,rowid) from emp); Source: CoolInterview.com

ODDNUMBER:
SELECT ENAME,SAL,DEPTNO,NUM
FROM
(SELECT EMPNO,ENAME,SAL,DEPTNO,
RANK()
OVER(ORDER BY SAL DESC)NUM
FROM EMP)
WHERE MOD(NUM,2)=1 Source: CoolInterview.com

-- odd numbers
SELECT *
FROM (SELECT rownum poradi, employee_id
FROM employees)
WHERE mod(poradi,2) = 0

-- even numbers
....
WHERE mod(poradi,2) = 1 Source: CoolInterview.com

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