How many different writers have written the episode with series number 8?
CREATE TABLE table_23958944_2 (written_by VARCHAR, no_by_series VARCHAR)
SELECT COUNT(written_by) FROM table_23958944_2 WHERE no_by_series = 8
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_23958944_2 (written_by VARCHAR, no_by_series VARCHAR) Question: How many different writers have written the episode with series number 8? [/INST] SELECT COUNT(written_by) FROM table_23958944_2 WHERE no_by_series = 8 </s>