CREATE TABLE table_name_8 (year VARCHAR, partner VARCHAR, venue VARCHAR)

In what Year did the German Open have Yoo Sang-Hee as Partner?
SELECT year FROM table_name_8 WHERE partner = "yoo sang-hee" AND venue = "german open"
SELECT "year" FROM "table_name_8" WHERE "german open" = "venue" AND "partner" = "yoo sang-hee"