-- Database schema
| College : cName [ TEXT ] primary_key , state [ TEXT ] , enr [ INT ] | Player : pID [ INT ] primary_key , pName [ TEXT ] , yCard [ TEXT ] , HS [ INT ] | Tryout : pID [ INT ] primary_key Tryout.pID = Player.pID , cName [ TEXT ] Tryout.cName = College.cName , pPos [ TEXT ] , decision [ TEXT ] |
-- -- What are the unique types of player positions in the tryout?

SELECT count(DISTINCT pPos) FROM tryout;