CREATE TABLE table_29235 ("Team" TEXT, "Outgoing manager" TEXT, "Manner of departure" TEXT, "Date of vacancy" TEXT, "Replaced by" TEXT, "Date of appointment" TEXT)

What is the date of appointment when the date of vacancy is 15 march 2011?
SELECT "Date of appointment" FROM table_29235 WHERE "Date of vacancy" = '15 March 2011'
SELECT "Date of appointment" FROM "table_29235" WHERE "Date of vacancy" = '15 March 2011'