This should do what you need it to do:
Code:
INSERT INTO tradeskill_recipe_entries (recipe_id, item_id, successcount, failcount, componentcount, salvagecount, iscontainer) SELECT r.id, 17187, 0, 0, 0, 0, 1 FROM tradeskill_recipe r WHERE r.tradeskill=68 AND r.id NOT IN (SELECT recipe_id FROM tradeskill_recipe_entries e WHERE e.item_id=17187);