When is the earliest year opened for huff hall that was established after 1974?
CREATE TABLE table_name_20 (opened INTEGER, venue VARCHAR, established VARCHAR)
SELECT MIN(opened) FROM table_name_20 WHERE venue = "huff hall" AND established > 1974
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_20 (opened INTEGER, venue VARCHAR, established VARCHAR) Question: When is the earliest year opened for huff hall that was established after 1974? [/INST] SELECT MIN(opened) FROM table_name_20 WHERE venue = "huff hall" AND established > 1974 </s>