Hi, after products submitted, how to batch add new "product feature" to all products?

[fortextiles]

Hi,

 

  I've finished edit & submit about 300 products, now I add a new "product feature", with a unique value.

 

  I want this "product feature" be added to every product, how can this action be done by batch? Is that necessary to use SQL query? If SQL is needed, then can you kindly tell me which SQL query to use, honestly I don't be familiar with SQL queries.

 

  My product detail page is quite simple, just picture plus a data sheet, :

  http://www.amazing-nm.com/print-pillow/1-decorative-pillow-covers-for-christmas-18x18.html

 

Detail:

Product feature names: Contact

Product feature values: some-texts

Want to apply to all products.

 

Regards,

Steven