CREATE TABLE table_29138 ("Team" CLOB, "Outgoing manager" CLOB, "Manner of departure" CLOB, "Date of vacancy" CLOB, "Incoming manager" CLOB, "Date of appointment" CLOB, "Position in Table" CLOB)

Who is the incoming manager when the date of vacancy was 21 march 2011?
SELECT "Incoming manager" FROM table_29138 WHERE "Date of vacancy" = '21 March 2011'
SELECT "Incoming manager" FROM "table_29138" WHERE "Date of vacancy" = '21 March 2011'