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 staff ( staff_id VARCHAR, staff_name VARCHAR )
TABLE: CREATE TABLE Staff_Department_Assignments ( staff_id VARCHAR )

### Question ###
Find the id and name of the staff who has been assigned for the shortest period.

### Accurate SQL ###

SELECT T1.staff_id, T1.staff_name FROM staff AS T1 JOIN Staff_Department_Assignments AS T2 ON T1.staff_id = T2.staff_id ORDER BY date_assigned_to - date_assigned_from LIMIT 1