When did the institution located in Lewiston, Maine join the conference? 
CREATE TABLE table_261931_2 (joined VARCHAR, location VARCHAR)
SELECT joined FROM table_261931_2 WHERE location = "Lewiston, Maine"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_261931_2 (joined VARCHAR, location VARCHAR) Question: When did the institution located in Lewiston, Maine join the conference?  [/INST] SELECT joined FROM table_261931_2 WHERE location = "Lewiston, Maine" </s>