SELECT count(obj_id) as 'In Stock'
FROM SHEET_INVENTORY s
INNER JOIN SHEETS h on s.variant_id = h.variant_id and s.size = h.size
INNER JOIN VARIANTS v on h.variant_id = v.variant_id
INNER JOIN CUT_SIZES c on h.size = c.cut_id
WHERE sheet_type = 'Glass' AND name = 'tangerine orange' AND height = 35 AND width = 20;