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Denodo returns no rows when a query includes correlated subqueries

Troubleshooting


Problem

A SQL statement executed by Denodo returns no rows when the SQL statement includes a correlated subquery.

The following SQL statement uses a subquery to select rows in the tsuppliers table based on value of the rows in the tsupply table.
SELECT
    "sno" AS "SNO", 
    "pno" AS "PNO", 
    "qty" AS "QTY"
FROM
    "tsupply" "sp1" 
WHERE 
    "qty" > (
    SELECT
        AVG(CAST('double', "qty"))
    FROM
        "tsupply" "sp2" 
    WHERE 
        "sp2"."jno" = "sp1"."jno" AND
        "sp2"."sno" IN ( 
            SELECT
                "sno"
            FROM
                "tsuppliers" "s" 
            WHERE 
                "s"."sno" = "sp1"."sno" )
    )
ORDER BY 
    "SNO" ASC, 
    "PNO" ASC

Symptom

Denodo server version 7 and 8 incorrectly returns a result set with no rows.

Document Location

Worldwide

[{"Type":"MASTER","Line of Business":{"code":"LOB76","label":"Data Platform"},"Business Unit":{"code":"BU048","label":"IBM Software"},"Product":{"code":"SSTSF6","label":"IBM Cognos Analytics"},"ARM Category":[{"code":"a8m0z0000001jkbAAA","label":"Reporting-\u003EPerformance"}],"ARM Case Number":"","Platform":[{"code":"PF002","label":"AIX"},{"code":"PF016","label":"Linux"},{"code":"PF033","label":"Windows"}],"Version":"All Versions"},{"Product":{"code":"SS6G84","label":"IBM Cognos Analytics on Cloud"},"Business Unit":{"code":"BU048","label":"IBM Software"},"Component":" ","Platform":[{"code":"","label":""}],"Version":"","Edition":"","Line of Business":{"code":"LOB76","label":"Data Platform"}},{"Product":{"code":"SSLKT6","label":"IBM Maximo Asset Management"},"Business Unit":{"code":"BU048","label":"IBM Software"},"Component":" ","Platform":[{"code":"","label":""}],"Version":"","Edition":"","Line of Business":{"code":"LOB77","label":"Automation Platform"}}]

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Document Information

Modified date:
15 January 2026

UID

ibm17086155

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