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Harish NallaHarish Nalla 

How to set validation rule for existing records?

Squire Q KershnerSquire Q Kershner
What are you asking?  Perhaps some additional detail on future posts will help the community understand and respond?

That being said, if what you are asking is "How do I apply a validation rule to existing records to address data quality" then the answer is "you cannot".  Validiation rules run on Save of the record.  However, once you have a validation rule in place, you should be able to create a report of the object, filtering for criteria that break your validation rule, and then update your records with a data load, to address the data quality.

Hope that helps?
JAY_PJAY_P
Hey Harish,
First go to that object in the right side you can see some small window pop up or directly go to there object and at the top u can see validation rule click on it and go to new validation rule and insert field and operator which u wanna create and make sure check syntax and active mode is on ....
Thank You