How many project staff worked as leaders or started working before '1989-04-24 23:51:54'?
CREATE TABLE Project_Staff (role_code VARCHAR, date_from VARCHAR)
SELECT COUNT(*) FROM Project_Staff WHERE role_code = 'leader' OR date_from < '1989-04-24 23:51:54'
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE Project_Staff (role_code VARCHAR, date_from VARCHAR) Question: How many project staff worked as leaders or started working before '1989-04-24 23:51:54'? [/INST] SELECT COUNT(*) FROM Project_Staff WHERE role_code = 'leader' OR date_from < '1989-04-24 23:51:54' </s>