How to create private blockchain

I have a db with datas like name, second name etc i want to store them in a blockchain, to tell the truth idk how to do it, i want to fetch data from db one by one store hash them and to put them into blockchain but i am not sure if someone will update data in the database will it affect to my blockchain hash? if you do not mind leave your email couse i have tones of questions about private blockchain

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