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Editorial Team
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Asked: 2026-06-16T00:11:56+00:00

I have some sql that will not return the rows I need unless I

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I have some sql that will not return the rows I need unless I specify that as a criteria in the where clause. If I uncomment the part below that is commented out, it will give me the rows I want. If I leave it commented out, those rows are not returned in my result set.

Does this make sense? Can anyone see anything I’m doing wrong? Thanks.

SELECT     
   RTRIM(c.comp2) + '-' + l.Loc_Name, 
   MAX(RTRIM(g.mega_location_num) + '-' + g.mega_location_name) 
FROM       
   mkt_share_comp c, gldm_location g, mkt_share_locs l 
WHERE     
   RTRIM(c.comp1) = g.location_num
   AND c.comp2 = l.Loc_No
   AND LEN(c.comp2) = 5 AND c.is_deleted = 0 AND l.is_deleted = 0
   --and  g.mega_location_num = '450'
GROUP BY
   RTRIM(c.comp2) + '-' + l.Loc_Name
ORDER BY
   MAX(RTRIM(g.mega_location_num) + '-' + g.mega_location_name)
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1 Answer

  1. Editorial Team

    This comparison:

    MAX(RTRIM(g.mega_location_num) + '-' + g.mega_location_name)

    Will be doing a MAX based on the string value that you’re constructing. So if there are any g.mega_location_num values which start with a digit greater than 4 (or start with 4 and have a second digit greater than 5, etc), then that value will be the MAX value returned.

    To start to fix this, I would first switch to the ANSI join style that Kuya has suggested. I would then consider including an appropriate ROW_NUMBER() expression to locate the “genuine” maximum value from the g table and to be able to retrieve multiple columns from that maximal row (to allow the string construction to proceed)

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