SQL to convert a row with 4 columns to 4 rows with 1 column

Sorry, I know this question has been asked hundreds of times before!

This is my starting SQL:

set linesize 500

with tbl_data AS
 (select 'N' argument1, 'Y' argument2, NULL argument3, 'Y' argument4 from dual)
select * from tbl_data;


ARGUMENT1 ARGUMENT2 ARGUMENT3 ARGUMENT4
--------- --------- --------- ---------
N         Y                   Y       

Is it possible to enter the data in this format:

                COL_HEADING
ARGUMENT1       N
ARGUMENT2       Y
ARGUMENT3       
ARGUMENT4       Y

I have read comments UNPIVOT but can't really work on the syntax to get a single line with 4 columns to appear as 4 rows with 1 column.

Sorry - I realize that I'm probably be lazy and stupid.

Any advice much appreciated, thank you.

Hello

Here's a way to do it with UNPIVOT:

SELECT *.

OF tbl_data

MUST INCLUDE NULL VALUES

(col_heading

FOR column-name IN (argument1

argument2

argument3

argument4

)

)

;

Output:

COLUMN COL_HEADING

--------- -----------

ARGUMENT1 N

ARGUMENT2 Y

ARGUMENT3

ARGUMENT4 Y

Tags: Database

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