converting rows to columns using oracle sql

I’m trying to convert rows into columns using the following sample:

LVL	COL_VALUE	TABLE_SRC
16	INT: ADDRESS_LINE_2:NULL	INT
16	BASE: ADDRESS_LINE_2:X	BASE
17	INT: ADDRESS_LINE_3:NULL	INT
17	BASE: ADDRESS_LINE_3:X	BASE

The output should be:

INT	BASE
INT: ADDRESS_LINE_2:NULL	BASE: ADDRESS_LINE_2:X
INT: ADDRESS_LINE_3:NULL	BASE: ADDRESS_LINE_3:X

The COL_VALUE with the same LVL should be in 1 row

I tried using PIVOT but it returns only 1 row because of the aggregate function

SELECT *
    FROM
        (
        SELECT 
                 BATCH_ID
                ,CONTACT_ID
                ,COL_VALUE
                ,TABLE_SRC
        FROM
            MISMATCH
        )
PIVOT
    (
        max(COL_VALUE) FOR TABLE_SRC IN ('1BASE' BASE, '1INT' INT)
    )

Answer

You can include LVL in the inner sub-query:

SELECT *
FROM   (
  SELECT  BATCH_ID
         ,CONTACT_ID
         ,COL_VALUE
         ,TABLE_SRC
         ,LVL
  FROM   MISMATCH
) PIVOT (
  max(COL_VALUE)
  FOR TABLE_SRC IN ('1BASE' BASE, '1INT' INT)
)

If you don’t want it in the output then change from SELECT * to a list of columns.

Which, for your sample data:

CREATE TABLE mismatch (batch_id, contact_id, LVL, COL_VALUE, TABLE_SRC) AS
SELECT 1, 1, 16, 'INT: ADDRESS_LINE_2:NULL', '1INT'  FROM DUAL UNION ALL
SELECT 1, 1, 16, 'BASE: ADDRESS_LINE_2:X',   '1BASE' FROM DUAL UNION ALL
SELECT 1, 1, 17, 'INT: ADDRESS_LINE_3:NULL', '1INT'  FROM DUAL UNION ALL
SELECT 1, 1, 17, 'BASE: ADDRESS_LINE_3:X',   '1BASE' FROM DUAL;

Outputs:

BATCH_ID	CONTACT_ID	LVL	BASE	INT
1	1	16	BASE: ADDRESS_LINE_2:X	INT: ADDRESS_LINE_2:NULL
1	1	17	BASE: ADDRESS_LINE_3:X	INT: ADDRESS_LINE_3:NULL

db<>fiddle here