How many n are listed for 0.6% r1b1a2 (r-m269)?
CREATE TABLE table_21481509_4 (COUnT VARCHAR, r1b1a2__r_m269_ VARCHAR)
SELECT COUnT AS n FROM table_21481509_4 WHERE r1b1a2__r_m269_ = "0.6%"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_21481509_4 (COUnT VARCHAR, r1b1a2__r_m269_ VARCHAR) Question: How many n are listed for 0.6% r1b1a2 (r-m269)? [/INST] SELECT COUnT AS n FROM table_21481509_4 WHERE r1b1a2__r_m269_ = "0.6%" </s>