user: Question: In what year is Zaxxon the Standalone?
Columns: ['Year', 'Arcade', 'Standalone', 'Console', 'Computer']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['1979 (1st)', 'Space Invaders', 'Space Invaders', 'Space Invaders', 'Space Invaders']
SQL:

assistant: SELECT "Year" FROM "Table" WHERE "Standalone" = 'Zaxxon';