What year had a date of TBA where the Oakland raiders were the home team?
CREATE TABLE table_name_80 (year INTEGER, date VARCHAR, designated_home VARCHAR)
SELECT AVG(year) FROM table_name_80 WHERE date = "tba" AND designated_home = "oakland raiders"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_80 (year INTEGER, date VARCHAR, designated_home VARCHAR) Question: What year had a date of TBA where the Oakland raiders were the home team? [/INST] SELECT AVG(year) FROM table_name_80 WHERE date = "tba" AND designated_home = "oakland raiders" </s>