Distinct function not work show dublicate values in output

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I have tried multiple time but result show multi value in out put . I have three table one for productimage(Imageid,Pid,ImageName,Imageextention) second for brands(Brandid,Name) and third one is products(PID,PBrandid,PImageid etc) output show multiple brandname but i want brandname not repeat

What I have tried:

select distinct b.Name,A.*,C.* from tblProduct A inner join tblBrands B  on A.PBrandID = B.BrandId
cross apply(
select top 1 * from tblProductImages C where A.PId= c.PID  order by b.Name desc
)C
order by b.Name desc

Posted 18-Mar-21 3:19am

Yscsharp

Updated 18-Mar-21 4:22am

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OriginalGriff · Answer 1 · 2021-03-18T04:22:00

DISTINCT returns rows that are entirely different, not rows that contain a single different column (unless you only return a single column).

So if there are 3 rows with identical Brands but different Names and you return both columns with DISTINCT you will get three rows. If you omit the Name column, you will get a single row.

The problem is that you don't describe a criteria by which SQL could decide which row of the three to return: you need to work out which of your images should be used for the Brand and then work out how to indicate that in SQL before you start coding a query!