How many kinds of roles are there for the staff?
CREATE TABLE Project_Staff (role_code VARCHAR)
SELECT COUNT(DISTINCT role_code) FROM Project_Staff
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE Project_Staff (role_code VARCHAR) Question: How many kinds of roles are there for the staff? [/INST] SELECT COUNT(DISTINCT role_code) FROM Project_Staff </s>