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

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'