input: Write a function to select all rows from a table where the 'status' is 'approved'.
  
  def select_approved_rows():
     sql = "SELECT * FROM table WHERE status = 'approved'"
     cur.execute(sql)
     return cur.fetchall()
  
  assert select_approved_rows() == [('approved_row1', 'approved'), ('approved_row2', 'approved')]
output: def select_approved_rows():
     sql = "SELECT * FROM table WHERE status = 'approved'"
     cur.execute(sql)
     return cur.fetchall()