CREATE TABLE table_10592536_8 (date_of_appointment VARCHAR, replaced_by VARCHAR)

What is the date of appointment when replaced by is roy hodgson?
SELECT date_of_appointment FROM table_10592536_8 WHERE replaced_by = "Roy Hodgson"
SELECT "date_of_appointment" FROM "table_10592536_8" WHERE "Roy Hodgson" = "replaced_by"