How many singles tournaments did Ludovic Walter win?
CREATE TABLE table_11900378_1 (tournament VARCHAR, singles_champions VARCHAR)
SELECT COUNT(tournament) FROM table_11900378_1 WHERE singles_champions = "Ludovic Walter"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_11900378_1 (tournament VARCHAR, singles_champions VARCHAR) Question: How many singles tournaments did Ludovic Walter win? [/INST] SELECT COUNT(tournament) FROM table_11900378_1 WHERE singles_champions = "Ludovic Walter" </s>