CREATE TABLE table_31406 ("Name" TEXT, "#" FLOAT, "Position" TEXT, "Height" TEXT, "Weight  (  lb.  ) " FLOAT, "Year" TEXT, "Hometown" TEXT, "Previous School" TEXT)

How many different items appear in the weight column when Pittsburgh, PA is the hometown?
SELECT COUNT("Weight ( lb. )") FROM table_31406 WHERE "Hometown" = 'Pittsburgh, PA'
SELECT COUNT("Weight ( lb. )") FROM "table_31406" WHERE "Hometown" = 'Pittsburgh, PA'