user: Question: What was the position of the player who played for the Rockets during 1981?
Columns: ['Player', 'No.(s)', 'Height in Ft.', 'Position', 'Years for Rockets', 'School/Club Team/Country']
Types: ['text', 'real', 'text', 'text', 'text', 'text']
Sample row: ['Sampson, Ralph Ralph Sampson', 50.0, '7-4', 'Forward / Center', '1983-88', 'Virginia']
SQL:

assistant: SELECT "Position" FROM "Table" WHERE "Years for Rockets" = '1981';