Home/ Questions/Q 215941
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-11T18:31:04+00:00

I have a query where I join a table on itself to find mismatches

  • 0

I have a query where I join a table on itself to find mismatches between a parts height or width. The only problem is that because of this join it will return each miss-match twice for each part. I only want to return one row for each miss-match, not two.

Here’s the table:

tblTagGlass
JobID varchar
UnitCode varchar
PartCode varchar
PartQty int
TagHeight float
TagWidth float

and the query:

select *
from tblTagGlass ttg
inner join tblTagGlass ttgC ON
ttg.JobID = ttgC.JobID
AND ttg.PartCode = ttgC.PartCode
where ttg.TagHeight != ttgC.TagHeight
or ttg.TagWidth != ttgC.TagWidth
order by ttg.PartCode

and the results:

INC375 U2-052 VT2-011 1 2013   1444.5   INC375 U2-028 VT2-011 1 2012.5 1444.5
INC375 U2-028 VT2-011 1 2012.5 1444.5   INC375 U2-052 VT2-011 1 2013   1444.5

I hope this makes sense…

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    Try

    select *
from tblTagGlass ttg
inner join tblTagGlass ttgC ON
ttg.JobID = ttgC.JobID
AND ttg.PartCode = ttgC.PartCode
where (ttg.TagHeight != ttgC.TagHeight OR ttg.TagWidth != ttgC.TagWidth)
AND ((ttg.TagHeight >= ttgC.TagHeight AND ttg.TagWidth >= ttgC.TagWidth) 
    OR (ttg.TagHeight > ttgC.TagHeight AND ttg.TagWidth < ttgC.TagWidth))
order by ttg.PartCode

    The difference is using > to compare them instead of !=

    • 0