CREATE TABLE table_3915 ("#" FLOAT, "Date" CLOB, "Opponent" CLOB, "Site/Stadium" CLOB, "Score" CLOB, "Win" CLOB, "Loss" CLOB, "Save" CLOB, "Attendance" FLOAT, "Overall Record" CLOB, "Pac-10 Record" CLOB)

How many different numbers are there for the game played on April 23?
SELECT COUNT("#") FROM table_3915 WHERE "Date" = 'April 23'
SELECT COUNT("#") FROM "table_3915" WHERE "Date" = 'April 23'