When was the date of appointment for St. Johnstone's manager? 
CREATE TABLE table_16075179_6 (date_of_appointment VARCHAR, team VARCHAR)
SELECT date_of_appointment FROM table_16075179_6 WHERE team = "St. Johnstone"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_16075179_6 (date_of_appointment VARCHAR, team VARCHAR) Question: When was the date of appointment for St. Johnstone's manager?  [/INST] SELECT date_of_appointment FROM table_16075179_6 WHERE team = "St. Johnstone" </s>