CREATE TABLE table_name_15 (type VARCHAR, unit VARCHAR)

Which type had the unit greifswald - 7 (kgr 7) ?
SELECT type FROM table_name_15 WHERE unit = "greifswald - 7 (kgr 7)"
SELECT "type" FROM "table_name_15" WHERE "greifswald - 7 (kgr 7)" = "unit"