Find and Delete duplicate records in a table

Many times you can face problem of duplicate records in table.So How would you identify and delete duplicate records in a table?

For that Firstly check if table has duplicate records or not using below query.

SELECT [FirstName] FROM tblTest GROUP BY [FirstName] HAVING COUNT(*) > 1

Then Delete duplicate records.

DELETE FROM tblTest WHERE ID NOT IN (SELECT MAX(ID) FROM tblTest GROUP BY [FirstName])