CREATE TABLE table_name_70 (visa_3 VARCHAR2, visa_4 VARCHAR2)

Which Visa 3 has a Visa 4 of youssouf hersi?
SELECT visa_3 FROM table_name_70 WHERE visa_4 = "youssouf hersi"
SELECT "visa_3" FROM "table_name_70" WHERE "visa_4" = "youssouf hersi"