DB2 - Invalid use of an aggregate function SQLCODE=-120 - sql

Question

Can anyone help me to understand what is wrong with this Db2 query syntax,it is failing with SQLCODE -120 because i am trying to use row_number()?
SELECT COUNT(ORDER_ID) OVER() TOTAL_NO_OF_RECORDS,
ROW_NUMBER() OVER (ORDER BY CREATED_DATE DESC) AS ROW_NUM
FROM (
SELECT DISTINCT A.ORDER_ID ORDER_ID,
B.AgencyName AS AGENCY_NAME,
C.FirstName FIRST_NAME,
C.LastName LAST_NAME,
DEMOGRAPHIC.State STATE,
A.CreatedTS CREATED_DATE,
E.WritingTIN WRITING_TIN,
E.ParentTIN PARENT_TIN
FROM DBO.TABLE1 A
INNER JOIN
DBO.TABLE2 TABLE2 ON TABLE2.ORDER_ID=A.ORDER_ID
INNER JOIN
DBO.TABLE3 TABLE3 ON TABLE3.QuoteId=TABLE2.QuoteId
INNER JOIN
DBO.Demographic DEMOGRAPHIC ON
DEMOGRAPHIC.DemographicId=TABLE3 .DemographicId
INNER JOIN
DBO.Agent E ON E.AgentId=DEMOGRAPHIC.AgentId
INNER JOIN
DBO.User USER ON USER.WebAcctID=AGENT.WebAcctId
INNER JOIN
DBO.Shopper SHOPPER ON SHOPPER.ShopperId=DEMOGRAPHIC.ShopperId
LEFT OUTER JOIN
DBO.Subsidy D ON D.demographicId=DEMOGRAPHIC.demographicId
LEFT OUTER JOIN
DBO.Employer EMPLOYER ON DEMOGRAPHIC.demographicId=EMPLOYER.demographicId
WHERE E.WritingTIN = 'XYZ' AND E.ParentTIN = 'XYZ'
AND DEMOGRAPHIC.State='OH'
AND A.Status IN ('X','Y','Z')
)AS ORDER_DETAILS
where ROW_NUMBER() OVER (ORDER BY CREATED_DATE DESC) BETWEEN ((1*50)-50)+1 AND 1*50 ORDER BY CREATED_DATE DESC
ERROR SHOWN:Invalid use of an aggregate function or OLAP function.. SQLCODE=-120, SQLSTATE=42903, DRIVER=4.18.60

Answer 1

You have multiple errors:
X is not defined in the subquery.
B.CREATED_DATE is referenced in the outer query, but it is not defined.
ROW_NUMBER() is used in the WHERE clause.
This would seem to be the intention of the query you write:
SELECT COUNT(*) OVER () NO_OF_RECORDS, ROW_NUM
FROM (SELECT A.ID, B.FirstName as FIRST_NAME, B.LastName as LAST_NAME,
MAX(B.CREATED_DATE) as CREATED_DATE,
ROW_NUMBER() OVER (ORDER BY MAX(CREATED_DATE) DESC) AS ROW_NUM
FROM SCHEMANAME.A A INNER JOIN
SCHEMANAME.B B
ON B.ShopperId = A.ShopperId LEFT OUTER JOIN
SCHEMANAME.C C
ON C.demographicId = B.demographicId
WHERE A.WritingTIN = 'XYZ' AND A.ParentTIN = 'XYZ' AND
B.State = 'OH' AND C.Status IN ('X', 'Y', 'Z')
GROUP BY A.ID, B.FirstName, B.LastName
) ORDER_DETAILS
WHERE ROW_NUM BETWEEN ((1*50)-50)+1 AND 1*50
ORDER BY CREATED_DATE DESC;
I'm not sure that this result makes sense, but it should fix your error.