CREATE TABLE table_2155350_2 (category VARCHAR2, cab_size VARCHAR2, sub_category VARCHAR2)

Name the category for cab size crew and super tanker
SELECT category FROM table_2155350_2 WHERE cab_size = "Crew" AND sub_category = "Super tanker"
SELECT "category" FROM "table_2155350_2" WHERE "Crew" = "cab_size" AND "Super tanker" = "sub_category"