CREATE TABLE table_2383 ("\\u2116" FLOAT, "#" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "Production code" CLOB, "U.S. viewers  ( millions ) " CLOB)

How many directors for #15?
SELECT COUNT("Directed by") FROM table_2383 WHERE "#" = '15'
SELECT COUNT("Directed by") FROM "table_2383" WHERE "#" = '15'