I am having many excel files in a folder, I have to create a tool to read those files and remove duplicate data between files using PHP and MYSQL.
So that i tried to read the data using Excel reader and store them in database
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I was struggling to remove the duplicate fields
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And also exporting the remaining data to excel file
Try this it may help you with your duplications http://www.databasejournal.com/features/mysql/article.php/10897_2201621_2/Deleting-Duplicate-Rows-in-a-MySQL-Database.htm
And if you want to import the data using php Click [Here]http://www.programmingfacts.com/export-mysql-data-into-excelcsv-via-php/