Finding Duplicates on a Column Subset with Detail
Students with same name and date of birth
WITH CTE (StudentId, Fname, LName, DOB, RowCnt)
SELECT StudentId, FirstName, LastName, DateOfBirth as DOB, SUM(1) OVER (Partition By FirstName,
LastName, DateOfBirth) as RowCnt
SELECT * from CTE where RowCnt > 1
ORDER BY DOB, LName
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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