Bulk attribute add?

Hello, Tessitura Hive Mind!

We have a large monthly mailing list in wordfly. We want to start using dynamic lists from Tessitura to manage these folks. They are primarily members. I need to add an attribute to their accounts to pull them into a new tessitura list. Does anyone have an SQL script to bulk add an attribute to a list of people, and/or to all active members? We are welcome to other ideas as well. 

Thank you!

-Joy Rudyanto

Database Specialist

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