CREATE TABLE table_18828487_1 (prize_fund VARCHAR2, venue VARCHAR2)

How much was the prize money for rwe-sporthalle, m lheim ?
SELECT prize_fund FROM table_18828487_1 WHERE venue = "RWE-Sporthalle, Mülheim"
SELECT "prize_fund" FROM "table_18828487_1" WHERE "RWE-Sporthalle, Mülheim" = "venue"