CREATE TABLE table_28120 ("Series #" FLOAT, "Season #" FLOAT, "Title" CLOB, "Director" CLOB, "Writer ( s ) " CLOB, "Airdate" CLOB)

How many directors worked on #158?
SELECT COUNT("Director") FROM table_28120 WHERE "Series #" = '158'
SELECT COUNT("Director") FROM "table_28120" WHERE "Series #" = '158'