What was the surface where the outcome was winner on 12 march 1989?
CREATE TABLE table_name_19 (surface VARCHAR, outcome VARCHAR, date VARCHAR)
SELECT surface FROM table_name_19 WHERE outcome = "winner" AND date = "12 march 1989"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_19 (surface VARCHAR, outcome VARCHAR, date VARCHAR) Question: What was the surface where the outcome was winner on 12 march 1989? [/INST] SELECT surface FROM table_name_19 WHERE outcome = "winner" AND date = "12 march 1989" </s>