How to include column names along with rows dynamically in Oracle - oracle

Question

I am trying to insert the column header and corresponding field into another table .
Table1 :
col1 col2 col3 col4
1 2 3 4
output should look like this:
COL_A COL_B COL_C COL_D COL_E COL_F COL_G COL_H
col1 1 col2 2 col3 3 col4 4
Table1 will be created dynamically , so structure of Table 1 might vary ,for eg .
sometime ,It might be
Case1:
col1 col2 col3 col4
1 2 3 4
For Case1 ,output should look like this:
COL_A COL_B COL_C COL_D COL_E COL_F COL_G COL_H
col1 1 col2 2 col3 3 col4 4
Or it might be
Case2:
col1 col2
1 2
For Case2 ,output should look like this:
COL_A COL_B COL_C COL_D
col1 1 col2 2
I got help with the static query for similar requirement in another question in Stack Overflow,but I was trying to convert the static query to dynamic query.
Static Query :
Static Table structure :
CREATE TABLE Table1
(col1 int, col2 int, col3 int, col4 int)
;
INSERT ALL
INTO Table1 (col1, col2, col3, col4)
VALUES (1, 2, 3, 4)
SELECT * FROM dual
;
Static Query :
SELECT * FROM
(
SELECT *
FROM Table1
UNPIVOT(val FOR col IN (
COL1
,COL2
,COL3
,COL4
))
)
PIVOT( MAX(COl) as C, MAX(VAL) as V FOR COL IN (
'COL1' as VAL1
,'COL2' as VAL2
,'COL3' as VAL3
,'COL4' as VAL4
));
Output :
VAL1_C VAL1_V VAL2_C VAL2_V VAL3_C VAL3_V VAL4_C VAL4_V
COL1 1 COL2 2 COL3 3 COL4 4
As I tried to make the static query dynamic ,I tried this :
SELECT * FROM
(
SELECT *
FROM Table1
UNPIVOT(val FOR col IN (
select regexp_substr((select * from (SELECT LISTAGG(COLUMN_NAME, ',') WITHIN GROUP ( order by COLUMN_ID) aa
FROM (select * from all_tab_columns where table_name = 'TABLE1'))),'[^,]+', 1, level) "yyy" from dual
connect by regexp_substr((select * from (SELECT LISTAGG(COLUMN_NAME, ',') WITHIN GROUP ( order by COLUMN_ID) aa
FROM (select * from all_tab_columns where table_name = 'TABLE1'))), '[^,]+', 1, level) is not null
))
)
PIVOT( MAX(COl) as C, MAX(VAL) as V FOR COL IN (
select regexp_substr((select '''' || AA ||'''' from (SELECT LISTAGG(COLUMN_NAME, ''',''') WITHIN GROUP ( order by COLUMN_ID) aa
FROM (select * from all_tab_columns where table_name = 'TABLE1'))),'[^,]+', 1, level) "yyy" from dual
connect by regexp_substr((select '''' || AA ||'''' from (SELECT LISTAGG(COLUMN_NAME, ''',''') WITHIN GROUP ( order by COLUMN_ID) aa
FROM (select * from all_tab_columns where table_name = 'TABLE1'))), '[^,]+', 1, level) is not null
));
But this throws error :
ORA-00904: : invalid identifier
00904. 00000 - "%s: invalid identifier"
*Cause:
*Action:
Error at Line: 6 Column: 5
I tried using dynamic sql .Below is the dynamic sql I used :
declare
sql_stmt varchar2(4000);
pivot_clause1 varchar2(4000);
pivot_clause2 varchar2(4000);
begin
SELECT LISTAGG(COLUMN_NAME, ',') WITHIN GROUP ( order by COLUMN_ID) aa
into pivot_clause1
FROM (select * from all_tab_columns where table_name = 'TEST11') ;
select * into pivot_clause2 from
(
select AA ||'''' aa
from (SELECT ''''||LISTAGG(COLUMN_NAME, ''',''') WITHIN GROUP ( order by COLUMN_ID) aa
FROM (select * from all_tab_columns where table_name = 'TEST11'))
);
dbms_output.put_line(pivot_clause1);
dbms_output.put_line(pivot_clause2);
sql_stmt := 'create table test13 as ('|| 'SELECT * FROM
(
SELECT *
FROM TEST11
UNPIVOT(val FOR col IN ( '
|| pivot_clause1 || '
))
)
PIVOT( MAX(COl) as C, MAX(VAL) as V FOR COL IN (' ||
pivot_clause2 || '
))
)';
execute immediate sql_stmt ;
end;
/
It is working fine for a table having description as below :
Name Null Type
---- ---- ----------
COL1 NUMBER(38)
COL2 NUMBER(38)
COL3 NUMBER(38)
COL4 NUMBER(38)
But it is not working for a table having description :
COL1 DATE
COL1 VARCHAR2(100)
COL1 VARCHAR2(100)
COL1 NUMBER
COL1 NUMBER
I am getting below error :
Error report -
ORA-01790: expression must have same datatype as corresponding expression
ORA-06512: at line 38
01790. 00000 - "expression must have same datatype as corresponding expression"
*Cause:
*Action:
I just learned unpivot cannot be used with columns having different datatype,Is there any way around ?
Can someone please help !!