How to get 2 columns data in One Column

Question

Hi,
I have requirement like below
EName       Sal
Smith         1000
Scott          2000
Miller          3000
I want to display this two column like as follows
Emp
Smith
1000
Scott
2000
Miller
3000
Thanks & Regards,
Hari Babu

Answer 1

Hi,
That's called Unpivoting.
In Oracle 11.1 (and higher) you can use the SELECT  ... UNPIVOT feature. For details and examples, see the SQL Language manual: http://docs.oracle.com/cd/E11882_01/server.112/e26088/statements_10002.htm#sthref6810
In any version of Oracle, you can cross-join your table to any table or result set that has at least 2 rows, and use CASE (or DECODE) to get the results you want.
Remember that a column can only have 1 datatype: it's impossible to have a column that's a VARCHAR2 on some rows, but a NUMBER on other rows.  You'll have to convert some data so that everything in the 1 output column has the same datatype.  There's no way to express 'Smith' as a NUMBER, but you can convert all the NUMBERs to strings.
I hope this answers your question.
If not, post  a little sample data (CREATE TABLE and INSERT statements), and also post the results you want from that data (if not what you posted already).
Post your best attempt at a query.  Point out where it is getting the wrong results, and explain, using specific examples, how you get those results from the given data in those places.
Always say which version of Oracle you're using (e.g., 11.2.0.2.0).
See the forum FAQ: https://forums.oracle.com/message/9362002