Has the product Chainring Bolts been on any of the sales?
a product that's been on sale refers to SellStartDate NOT null and vice versa;
SELECT CASE WHEN COUNT(T1.Description) >= 1 THEN 'Yes' ELSE 'No' END FROM SpecialOffer AS T1 INNER JOIN SpecialOfferProduct AS T2 ON T1.SpecialOfferID = T2.SpecialOfferID INNER JOIN Product AS T3 ON T2.ProductID = T3.ProductID WHERE T3.Name = 'Chainring Bolts'