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Editorial Team
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Asked: 2026-06-17T13:10:34+00:00

What’s wrong with my sql query? I am trying to use a Join and

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What’s wrong with my sql query? I am trying to use a Join and at the same time a UNION to get all table from another table while joining other tables together based on a relationship ..

However I get the following error:

"The used SELECT statements have a different number of columns"

My query:

SELECT a.ESN, a.UnixTime, a.Payload, a.Timestamp
                ,b.AlarmingStatus
                ,b.STxModel
                ,c.GroupID
                FROM STxMessage a
                JOIN STx b ON b.ESN = a.ESN
                JOIN GroupInfo c ON b.GroupID = c.GroupID
                WHERE b.STxModel = 190
                AND a.AlarmsChecked="y"
                AND c.AlertsMasterSwitch="on"
               UNION ALL 
      SELECT d.ESN , d.UnixTime,  d.Payload,  d.Timestamp FROM STxMessageArchive d
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1 Answer

  1. Editorial Team

    Your first query is selecting 7 columns where as the second query is only selecting 4. You need to make sure the second query is selecting the same number of columns as the first to make the Union All work.

    SELECT a.ESN, a.UnixTime, a.Payload, a.Timestamp
                ,b.AlarmingStatus
                ,b.STxModel
                ,c.GroupID
                FROM STxMessage a
                JOIN STx b ON b.ESN = a.ESN
                JOIN GroupInfo c ON b.GroupID = c.GroupID
                WHERE b.STxModel = 190
                AND a.AlarmsChecked="y"
                AND c.AlertsMasterSwitch="on"
               UNION ALL 
      SELECT d.ESN , d.UnixTime,  d.Payload,  d.Timestamp, 'null' as AlarmingStatus,
      'null' as STxModel, 'null' as GroupID FROM STxMessageArchive d
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