How many positions is player Tom Glavine?
CREATE TABLE table_21721351_18 (position VARCHAR, player VARCHAR)
SELECT COUNT(position) FROM table_21721351_18 WHERE player = "Tom Glavine"
### Context: CREATE TABLE table_21721351_18 (position VARCHAR, player VARCHAR) ### Question: How many positions is player Tom Glavine? ### Answer: SELECT COUNT(position) FROM table_21721351_18 WHERE player = "Tom Glavine"