How to unpivot a single row in Oracle 11? - sql

Question

I have a row of data and I want to turn this row into a column so I can use a cursor to run through the data one by one. I have tried to use
SELECT * FROM TABLE(PIVOT(TEMPROW))
but I get
'PIVOT' Invalid Identifier error.
I have also tried that same syntax but with
('select * from TEMPROW')
Everything I see using pivot is always using count or sum but I just want this one single row of all varchar2 to turn into a column.
My row would look something like this:
ABC | 123 | aaa | bbb | 111 | 222 |
And I need it to turn into this:
ABC
123
aaa
bbb
111
222
My code is similar to this:
BEGIN
OPEN C_1 FOR SELECT * FROM TABLE(PIVOT( 'SELECT * FROM TEMPROW'));
LOOP
FETCH C_1 INTO TEMPDATA;
EXIT WHEN C_2%NOTFOUND;
DBMS_OUTPUT.PUT_LINE(1);
END LOOP;
CLOSE C_1;
END;

Answer 1

You have to unpivot to convert whole row into 1 single column
select * from Table
UNPIVOT
(col for col in (
'ABC' , '123' , 'aaa' ,' bbb' , '111' , '222'
))
or use union but for that you need to add col names manually like
Select * from ( Select col1 from table
union
select col2 from table union...
Select coln from table)
sample output to show as below

Answer 2

One option for unpivoting would be numbering columns by decode() and cross join with the query containing the column numbers :
select decode(myId, 1, col1,
2, col2,
3, col3,
4, col4,
5, col5,
6, col6 ) as result_col
from temprow
cross join (select level AS myId FROM dual CONNECT BY level <= 6 );
or use a query with unpivot keyword by considering the common expression for the column ( namely col in this case ) must have same datatype as corresponding expression :
select result_col from
(
select col1, to_char(col2) as col2, col3, col4,
to_char(col5) as col5, to_char(col6) as col6
from temprow
)
unpivot (result_col for col in (col1,col2,col3,col4,col5,col6));
Demo