Between the years 1990 and 2007, of the total rebounds achieved by each player, how many managed to exceed 75% of defensive rebounds?
the year 1990 and 2007 refers to year BETWEEN 1990 AND 2007; exceed 75% of defensive rebounds refers to Divide (dRebounds, rebounds) * 100 > 75
SELECT COUNT(DISTINCT playerID) FROM player_allstar WHERE CAST(d_rebounds AS REAL) * 100 / rebounds > 75 AND season_id BETWEEN 1990 AND 2007