CREATE TABLE table_17085981_2 (date_of_appointment VARCHAR, replaced_by VARCHAR)

How many appointment dates were recorded when J rgen Kohler was the replaced by?
SELECT COUNT(date_of_appointment) FROM table_17085981_2 WHERE replaced_by = "Jürgen Kohler"
SELECT COUNT("date_of_appointment") FROM "table_17085981_2" WHERE "Jürgen Kohler" = "replaced_by"