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divya gourigari 14divya gourigari 14 

how can we write code for equating external csv file records and existing database records in salesforce apex

SandhyaSandhya (Salesforce Developers) 
Hi,

If you are looking to update the existing records through Apex then below thread has the sample code which you can modify to your needs.

https://developer.salesforce.com/forums/?id=9060G000000Bir6QAC
 
Please mark it as solved if my reply was helpful. It will make it available for other as the proper solution.
                                             
Best Regards
Sandhya