what is the minimum stage where mountains classification is aitor osa and aitor gonzález won?
CREATE TABLE table_15088557_1 (stage INTEGER, mountains_classification VARCHAR, winner VARCHAR)
SELECT MIN(stage) FROM table_15088557_1 WHERE mountains_classification = "Aitor Osa" AND winner = "Aitor González"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_15088557_1 (stage INTEGER, mountains_classification VARCHAR, winner VARCHAR) Question: what is the minimum stage where mountains classification is aitor osa and aitor gonzález won? [/INST] SELECT MIN(stage) FROM table_15088557_1 WHERE mountains_classification = "Aitor Osa" AND winner = "Aitor González" </s>