[sql] Copy data from one column to other column (which is in a different table)

I think that all previous answers are correct, this below code is very valid specially if you have to update multiple rows at once, note: it's PL/SQL

DECLARE
    CURSOR myCursor IS 
      Select contacts.BusinessCountry 
      From contacts c WHERE c.Key = t.Key;
    ---------------------------------------------------------------------
BEGIN
    FOR resultValue IN myCursor LOOP
        Update tblindiantime t
        Set CountryName=resultValue.BusinessCountry 
        where t.key=resultValue.key;
    END LOOP;
END;

I wish this could help.