CREATE TABLE table_name_1 (week_1 VARCHAR2, week_2 VARCHAR2)

Which week 1 had a week 2 of Claudia Nathalia?
SELECT week_1 FROM table_name_1 WHERE week_2 = "claudia nathalia"
SELECT "week_1" FROM "table_name_1" WHERE "claudia nathalia" = "week_2"