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I need to change columns of a table into rows. can we make it if so please give a reply

Answer 1

I need to change columns of a table into rows.http://www.dba-oracle.com/t_display_multiple_column_values_same_rows.htm
- Write a PL/SQL function
You can write a PL/SQL function to display multiple rows values on a single line. Martin Chadderton has written a Pl/SQL function called "stragg" that you can define to display multiple SQL rows on one single line. Once defined, you embed the function within your SQL to display your output on a single line:
select stragg(ename) from emp;
Smith, Jones, Baker
- Use the SYS_CONNECT_BY_PATH operator
This article by Younes Naguib describes how to display multiple values from a single column in a single output row. In his example, he displays multiple values of the last name column on a single row. Note his use of the sys_connect_by_path and over operators:
select
deptno,
substr(SYS_CONNECT_BY_PATH(lname, ','),2) name_list
from
select
lname,
deptno,
count(*) OVER ( partition by deptno ) cnt,
ROW_NUMBER () OVER ( partition by deptno order by lname) seq
from
igribun.emp
where
deptno is not null)
where
seq=cnt
start with
seq=1
connect by prior
seq+1=seq
and prior
deptno=deptno;
DEPTNO NAME_LIST
1 Komers,Mokrel,Stenko
2 Hung,Tong
3 Hamer
4 Mansur
- Use a Cross join
Matt contributed this handy SQL techniques to pivot one row of several columns into a single column with several row, using the Oracle cross join syntax. Matt notes that the Cross join "has other uses in conjunction with a WHERE clause to create triangular result sets for rolling totals etc (though thanks to analytic functions those things are very nice and easy)".
SELECT
ite,
case
when ite = 'item1' then item1
when ite = 'item2' then item2
when ite = 'item3' then item3
end as val
FROM
SELECT
pivoter.ite,
item1,
item2,
item3
FROM
someTable
CROSS JOIN
select 'item1' as ite from dual
UNION ALL
select 'item2' as ite from dual
UNION ALL
select 'item3' as ite from dual
)pivoter
- Oracle analytic Lag-Over Function
Analytic functions have a pronounced performance improvement since they avoid an expensive self-join and only make one full-table scan to get the results. This site shows an example of using the Oracle LAG function to display multiple rows on a single column:
SELECT
ename,
hiredate,sal,
LAG (sal, 1, 0)
OVER (ORDER BY hiredate) AS PrevSal
FROM
emp
WHERE
job = 'CLERK';
Ename Hired SAL PREVSAL
SMITH 17-DEC-80 800 0
JAMES 03-DEC-81 950 800
MILLER 23-JAN-82 1300 950
ADAMS 12-JAN-83 1100 1300
Hope this helps. . .
Don Burleson
Oracle Press author