Need a query to seperate char values and number values from table in oracle [closed] - oracle

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I have table TAB1 which is having one column COL1. as shown below.
TAB1
COL1
123
Xyz
CM
44
I need single query which will give following output.
Ccol | Ncol
Xyz | 123
CM | 45

Answer 1

From Oracle 12 you can define a function in a sub-query factoring clause and this can easily determine whether a value is numeric:
Oracle Setup:
CREATE TABLE table_name (COL1) AS
SELECT '123' FROM DUAL UNION ALL
SELECT 'Xyz' FROM DUAL UNION ALL
SELECT 'CM' FROM DUAL UNION ALL
SELECT '44' FROM DUAL UNION ALL
SELECT '1E3' FROM DUAL UNION ALL
SELECT '-1.2' FROM DUAL
Query:
WITH
FUNCTION isNumeric( value VARCHAR2 ) RETURN NUMBER
IS
n NUMBER;
BEGIN
n := TO_NUMBER( value );
RETURN 1;
EXCEPTION
WHEN OTHERS THEN
RETURN 0;
END;
SELECT Ccol,
TO_NUMBER( Ncol ) AS Ncol
FROM (
SELECT col1,
isNumeric( col1 ) AS isNumber,
ROW_NUMBER() OVER ( PARTITION BY isNumeric( col1 ) ORDER BY ROWNUM ) AS rn
FROM table_name
)
PIVOT ( MAX( Col1 ) FOR isNumber IN ( 0 AS Ccol, 1 AS Ncol ) )
ORDER BY rn
Output:
CCOL | NCOL
:--- | ---:
Xyz | 123
CM | 44
null | 1000
null | -1.2
db<>fiddle here
In earlier versions you can use CREATE FUNCTION rather than defining it in the query.

Answer 2

You can try this query:
WITH TAB1(COL1) AS
(
SELECT '123' FROM DUAL UNION ALL
SELECT 'Xyz' FROM DUAL UNION ALL
SELECT 'CM' FROM DUAL UNION ALL
SELECT '44' FROM DUAL
)
-- Actual query starts from here
, CTE AS (SELECT
COL1,
NUMERIC,
ROW_NUMBER() OVER(
PARTITION BY NUMERIC
ORDER BY LENGTH(COL1) DESC -- here I considered that Xyz and 123 both have length 3 and are related and same for CM and 44
) AS RN
FROM
(
SELECT
COL1,
CASE
WHEN REGEXP_LIKE ( COL1,
'^[[:digit:]]+$' ) THEN 'NUMBER'
ELSE 'NOT NUMBER'
END AS NUMERIC
FROM
TAB1
))
SELECT
C.COL1 AS "Ccol",
N.COL1 AS "Ncol"
FROM
CTE N
FULL OUTER JOIN CTE C ON ( N.RN = C.RN )
WHERE
N.NUMERIC = 'NUMBER'
AND C.NUMERIC = 'NOT NUMBER';
Output:
Cco Nco
--- ---
Xyz 123
CM 44
db<>fiddle demo
Cheers!!