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() == [(1, 'approved'), (2, 'approved')], "Expected rows with status 'approved'"
  assert select_approved_rows() == [], "Expected no rows with status 'approved'"
  assert select_approved_rows() == [(3, 'approved'), (4, 'approved'), (5, 'approved')], "Expected multiple rows with status 'approved'"
output: def select_approved_rows():
     sql = "SELECT * FROM table WHERE status = 'approved'"
     cur.execute(sql)
     return cur.fetchall()