CREATE TABLE table_11734041_20 (player VARCHAR2, years_for_rockets VARCHAR2)

what is the total number of player where years for rockets is 1975-79
SELECT COUNT(player) FROM table_11734041_20 WHERE years_for_rockets = "1975-79"
SELECT COUNT("player") FROM "table_11734041_20" WHERE "1975-79" = "years_for_rockets"