Table: olymp_qual_squads_2008
Columns: player
height
position
year_born_age
current_club

Question: Count the average Height which has a Position of pf, and a Year born (Age) on april 1, 1981 (age32)?
SQL: SELECT AVG("height") FROM olymp_qual_squads_2008 WHERE "position" = 'pf' AND "year_born_age" = 'april 1, 1981 (age32)'

Question: Which Height has a Position of c, and a Player of yiannis bourousis?
SQL: SELECT SUM("height") FROM olymp_qual_squads_2008 WHERE "position" = 'c' AND "player" = 'yiannis bourousis'