How many number in series's are written by Greg Haddrick?
CREATE TABLE table_21666472_1 (no_in_series VARCHAR, written_by VARCHAR)
SELECT COUNT(no_in_series) FROM table_21666472_1 WHERE written_by = "Greg Haddrick"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_21666472_1 (no_in_series VARCHAR, written_by VARCHAR) Question: How many number in series's are written by Greg Haddrick? [/INST] SELECT COUNT(no_in_series) FROM table_21666472_1 WHERE written_by = "Greg Haddrick" </s>