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SQLServer Finding Duplicates on a Column Subset with Detail

Students with same name and date of birth

WITH CTE (StudentId, Fname, LName, DOB, RowCnt)
as (
SELECT StudentId, FirstName, LastName, DateOfBirth as DOB, SUM(1) OVER (Partition By FirstName,
LastName, DateOfBirth) as RowCnt
FROM tblStudent
SELECT * from CTE where RowCnt > 1

This example uses a Common Table Expression and a Window Function to show all duplicate rows (on a subset of columns) side by side.


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