In what round did Al Unser win at Wisconsin State Fair Park Speedway? 
CREATE TABLE table_22673872_1 (rnd INTEGER, winning_driver VARCHAR, track VARCHAR)
SELECT MIN(rnd) FROM table_22673872_1 WHERE winning_driver = "Al Unser" AND track = "Wisconsin State Fair Park Speedway"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_22673872_1 (rnd INTEGER, winning_driver VARCHAR, track VARCHAR) Question: In what round did Al Unser win at Wisconsin State Fair Park Speedway?  [/INST] SELECT MIN(rnd) FROM table_22673872_1 WHERE winning_driver = "Al Unser" AND track = "Wisconsin State Fair Park Speedway" </s>