CREATE TABLE table_23575 ("Story #" FLOAT, "Target #" TEXT, "Title" TEXT, "Author" TEXT, "Reader" TEXT, "Format" TEXT, "Company" TEXT, "Release Date" TEXT, "Notes" TEXT)

How many different release dates are there for the audio book with a story number 7?
SELECT COUNT("Release Date") FROM table_23575 WHERE "Story #" = '7'
SELECT COUNT("Release Date") FROM "table_23575" WHERE "Story #" = '7'