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Editorial Team
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Asked: 2026-06-04T22:37:19+00:00

I am running several instances of the same query. The below version should not

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I am running several instances of the same query. The below version should not be returning any data but I am getting 1 row with ‘null’ in each of the columns:

SELECT (CASE ScanName WHEN 'SYSTEM-HQ' THEN 'HQ
System' END) AS System, 
sum(CASE pspplMSSeverity WHEN 1 THEN 10 WHEN 2 THEN 9 WHEN 
3 THEN 6 WHEN 4 THEN 3 END) AS Score, 
(sum(CASE pspplMSSeverity WHEN 1 THEN 10 WHEN 2 THEN 9 
WHEN 3 THEN 6 WHEN 4 THEN 3 END)/COUNT(pspplMSSeverity)) AS 
Grade 
FROM missingpatches 
WHERE ScanName like '%SYSTEM-HQ%' 
ORDER BY LAST_UPDATE DESC LIMIT 1

How can I modify this query to ensure that I am only returning data when valid values exist?

Could this be due to the use of the Case and Sum within the primary SQL statement that are causing the Null data to be returned?

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1 Answer

  1. Editorial Team
    SELECT (CASE ScanName WHEN 'SYSTEM-HQ' THEN 'HQ
System' END) AS System, 
sum(CASE pspplMSSeverity WHEN 1 THEN 10 WHEN 2 THEN 9 WHEN 
3 THEN 6 WHEN 4 THEN 3 END) AS Score, 
(sum(CASE pspplMSSeverity WHEN 1 THEN 10 WHEN 2 THEN 9 
WHEN 3 THEN 6 WHEN 4 THEN 3 END)/COUNT(pspplMSSeverity)) AS 
Grade 
FROM missingpatches 
WHERE ScanName like '%SYSTEM-HQ%' 
HAVING System IS NOT NULL # Added
ORDER BY LAST_UPDATE DESC LIMIT 1

    Try add a HAVING.

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