Transpose multiple Columns at same - sql

Question

I have this:
Year Apple Orange
1 100 150
2 200 250
3 300 350
2 200 250
1 100 150
I need this:
Fruit 1 2 3
Apple 200 400 300
Orange 300 500 350
I have option A and option B, but it only transposes 1 fruit unless i do an "Union all".
Option A:
select
'Apple' as Fruit
,MAX(DECODE(year, '1', sum(Apple)) "1"
,MAX(DECODE(year, '2', sum(Apple)) "2"
from MyTable
Option B:
select
*
from (
select
Apple
,Year
from MyTable
)
PIVOT(sum(Apple) for year in ('1', '2', '3'))
Question:
Can U transpose all columns without an "Union"?

Answer 1

Oracle Setup:
CREATE TABLE table_name ( year, apple, orange ) AS
SELECT 1, 100, 150 FROM DUAL UNION ALL
SELECT 2, 200, 250 FROM DUAL UNION ALL
SELECT 3, 300, 350 FROM DUAL UNION ALL
SELECT 2, 200, 250 FROM DUAL UNION ALL
SELECT 1, 100, 150 FROM DUAL;
Query - Unpivot then pivot:
SELECT *
FROM (
SELECT *
FROM table_name
UNPIVOT( value FOR fruit IN ( Apple, Orange ) )
)
PIVOT ( SUM( value ) FOR year IN ( 1, 2, 3 ) );
Output:
FRUIT 1 2 3
------ --- --- ---
ORANGE 300 500 350
APPLE 200 400 300

Answer 2

This is how you can do it dynamically.
Create statements
CREATE TABLE MyTable
(Year int, Apple int, Orange int) ;
INSERT ALL
INTO MyTable (Year, Apple, Orange) VALUES (1, 100, 150)
INTO MyTable (Year, Apple, Orange) VALUES (2, 200, 250)
INTO MyTable (Year, Apple, Orange) VALUES (3, 300, 350)
INTO MyTable (Year, Apple, Orange) VALUES (2, 200, 250)
INTO MyTable (Year, Apple, Orange) VALUES (1, 100, 150)
SELECT * FROM dual;
Run this in SQL Developer or SQLPlus (I tried in SQL Developer).
Or you can encapsulate it in a procedure and can return the result.
SET ServerOutput ON size 100000;
variable rc refcursor;
DECLARE
v_column_list varchar2 (2000);
v_years varchar2(2000);
BEGIN
SELECT listagg('"' || column_name || '"', ',') within
GROUP (ORDER BY column_id)
INTO v_column_list
FROM all_tab_columns
WHERE table_name = 'MYTABLE'
AND column_name <> 'YEAR';
SELECT listagg(year, ',') within
GROUP (ORDER BY year)
INTO v_years
FROM (
SELECT DISTINCT year
FROM MyTable);
-- dbms_output.put_line(' v_column_list =' || v_column_list);
-- dbms_output.put_line(' v_years =' || v_years);
OPEN :rc FOR
'SELECT * FROM
( SELECT *
FROM MyTable
UNPIVOT ( val for fruit in ( ' || v_column_list || ' )
)
)
PIVOT ( sum ( val ) for year in ( ' || v_years || ' ) )';
END;
/
PRINT :rc
Output:
------------------------------------------------------------------------
FRUIT 1 2 3
------ ---------------------- ---------------------- ----------------------
ORANGE 300 500 350
APPLE 200 400 300