How many stages did Team Sky lead the teams classification?
CREATE TABLE table_26010857_13 (stage INTEGER, teams_classification VARCHAR)
SELECT MAX(stage) FROM table_26010857_13 WHERE teams_classification = "Team Sky"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_26010857_13 (stage INTEGER, teams_classification VARCHAR) Question: How many stages did Team Sky lead the teams classification? [/INST] SELECT MAX(stage) FROM table_26010857_13 WHERE teams_classification = "Team Sky" </s>