Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_30980 ( "Conference" text, "Regular Season Winner" text, "Conference Player of the Year" text, "Conference Tournament" text, "Tournament Venue (City)" text, "Tournament Winner" text )

### Question ###
Who was the regular season winner of the 1999 Big Sky Men's Basketball Tournament was the conference tournament?

### Accurate SQL ###

SELECT "Regular Season Winner" FROM table_30980 WHERE "Conference Tournament" = '1999 Big Sky Men''s Basketball Tournament'