What year did Bangkok University and Chunnam Dragons have a score of 0-0?
CREATE TABLE table_name_31 (season INTEGER, team_2 VARCHAR, team_1 VARCHAR, score VARCHAR)
SELECT SUM(season) FROM table_name_31 WHERE team_1 = "bangkok university" AND score = "0-0" AND team_2 = "chunnam dragons"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_31 (season INTEGER, team_2 VARCHAR, team_1 VARCHAR, score VARCHAR) Question: What year did Bangkok University and Chunnam Dragons have a score of 0-0? [/INST] SELECT SUM(season) FROM table_name_31 WHERE team_1 = "bangkok university" AND score = "0-0" AND team_2 = "chunnam dragons" </s>