Hi,
I have custom object: School__c, in that I have a (checkbox)custom field: Old student__c.
There are more than 1000 records in that school object.

I want to udpate Old Student__c =true.

I don't want to edit each and every record and do it manually.
I don't want to bring back data with tools and again update-it's RISKY
Let me know How I can achive this.

Thanks in advance.