How many winning constructor catagories are there when Mark Webber had the fastest lap? 
CREATE TABLE table_26258348_4 (winning_constructor VARCHAR, fastest_lap VARCHAR)
SELECT COUNT(winning_constructor) FROM table_26258348_4 WHERE fastest_lap = "Mark Webber"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_26258348_4 (winning_constructor VARCHAR, fastest_lap VARCHAR) Question: How many winning constructor catagories are there when Mark Webber had the fastest lap?  [/INST] SELECT COUNT(winning_constructor) FROM table_26258348_4 WHERE fastest_lap = "Mark Webber" </s>