What is the region 1 where region 4 is tba is the complete eighth series?
CREATE TABLE table_1337525_1 (region_1 VARCHAR, region_4 VARCHAR, complete_series VARCHAR)
SELECT region_1 FROM table_1337525_1 WHERE region_4 = "TBA" AND complete_series = "The Complete Eighth Series"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_1337525_1 (region_1 VARCHAR, region_4 VARCHAR, complete_series VARCHAR) Question: What is the region 1 where region 4 is tba is the complete eighth series? [/INST] SELECT region_1 FROM table_1337525_1 WHERE region_4 = "TBA" AND complete_series = "The Complete Eighth Series" </s>