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_22 (tie_no INTEGER, date VARCHAR)
### Question:
What is the average Tie no when the date is Birmingham City?
### Answer:
SELECT AVG(tie_no) FROM table_name_22 WHERE date = "birmingham city"