CREATE TABLE table_13547 ("Team" CLOB, "Outgoing manager" CLOB, "Manner of departure" CLOB, "Date of vacancy" CLOB, "Replaced by" CLOB, "Date of appointment" CLOB, "Position in table" CLOB)

what is the manner of departure when the date of vacancy is 15 september 2008?
SELECT "Manner of departure" FROM table_13547 WHERE "Date of vacancy" = '15 september 2008'
SELECT "Manner of departure" FROM "table_13547" WHERE "Date of vacancy" = '15 september 2008'