Question

I have two tables with these columns:

Users:
user, class, grade, location.

Classes:
class, location

The class column of the Users table references the same colmn in Classes table.

I want to update all rows in the Users table such that each row of the Users table’s “location” column is equal to the location of the class.

So i have a row with values:
Mike, Math, A+, New York

And the corresponding row in Classes table for Math is:
Math, Chicago

I want the user table’s row to become
Mike, Math, A+, Chicago.

Thanks

Answer 1

update users a
    set a.location =
     (select b.location 
      from classes b
      where b.class = a.class)