How to find the duplicate records in the database

My friends question;  Which is the method, good to find the duplicate records in the set of records entered in a worksheet.

Answer:

There are various methods followed to find the duplicate records in a database stored in a excel.

a.  In Excel 2007 and above, Conditional Formatting  is the easiest way.
b.  Use the 'countif' formula
c.  Use  a Pivot table function
d.  Use  Subtotal function
e.  Use Advanced filter
f.    Remove duplicate button  Alt A, M 

User has to chose the appropriate method to find the duplicate records. 

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