Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_7211 ( "Team" text, "Outgoing manager" text, "Manner of departure" text, "Date of vacancy" text, "Replaced by" text, "Date of appointment" text )

### Question ###
What is the date of appointment for the team with a resigned manner of departure and replaced by Sandy Clark?

### Accurate SQL ###

SELECT "Date of appointment" FROM table_7211 WHERE "Manner of departure" = 'resigned' AND "Replaced by" = 'sandy clark'