Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_40 (date VARCHAR, tournament VARCHAR, runner_s__up VARCHAR)
### Question:
Which date was the Memorial Tournament held on, when Payne Stewart was runner-up?
### Answer:
SELECT date FROM table_name_40 WHERE tournament = "memorial tournament" AND runner_s__up = "payne stewart"