Table schema:
CREATE TABLE table_23981741_1 (release_date VARCHAR, year VARCHAR, additional_rock_band_3_features VARCHAR)

Question: How many release dates are there for year of 1988 and additional rock band 3 features is none?
SQL: SELECT COUNT(release_date) FROM table_23981741_1 WHERE year = 1988 AND additional_rock_band_3_features = "None"