How to find duplicate records in SQL?

Question

I am trying to develop a query to insert unique records but am receiving the SQL Server Primary Key error for trying to insert duplicate records. I was able to insert some values with this query but not for this record (score_14).

So now I am trying to find duplicate record with the following query. The challenge is that my PK is based on 3 columns: StudentID, MeasureDate, and MeasureID--all from a different table not mentioned below.

But this only shows me count--instead I want to just return records with count > 1. How do I do that?

select count(a.score_14) as score_count, A.studentid, A.measuredate, B.measurename+' ' +B.LabelName 
from [J5C_Measures_Sys] A
join [J5C_ListBoxMeasures_Sys] B on A.MeasureID = B.MeasureID 
join sysobjects so on so.name = 'J5C_Measures_Sys' 
join syscolumns sc on so.id = sc.id 
join [J5C_MeasureNamesV2_Sys] v on v.Score_field_id = sc.name
where so.type = 'u' and sc.name = 'score_14' and a.score_14 is not null 
AND A.STUDENTID IS NOT NULL AND A.MEASUREDATE IS NOT NULL AND B.MEASURENAME IS NOT NULL
--and count(a.score_14)>1
group by a.studentid, a.measuredate, B.measurename, B.LabelName, A.score_14
having count(a.score_14) > 1

Answer 1

you need to take A.score_14 out of your group by clause if you want to count it

Answer 2

Beth is correct - here's my re-write of your query:

SELECT a.studentid, a.measuredate, a.measureid
  from [J5C_Measures_Sys] A
GROUP BY a.studentid, a.measuredate, a.measureid
  HAVING COUNT(*) > 1

Previously:

SELECT a.studentid, a.measuredate, a.measureid
  from [J5C_Measures_Sys] A
  join [J5C_ListBoxMeasures_Sys] B on A.MeasureID = B.MeasureID 
  join sysobjects so on so.name = 'J5C_Measures_Sys'
                    AND so.type = 'u'
  join syscolumns sc on so.id = sc.id 
                    and sc.name = 'score_14' 
  join [J5C_MeasureNamesV2_Sys] v on v.Score_field_id = sc.name
 where a.score_14 is not null  
   AND B.MEASURENAME IS NOT NULL
GROUP BY a.studentid, a.measuredate, a.measureid
  HAVING COUNT(*) > 1