comparable sales in six years during its most recent quarter and it offered a cautious outlook for the year, sending company shares down 6% before the opening bell Thursday. stores, which measure sales at stores open at least a year along with online sales tied to those locations, rose 2. Excluding the wellness category that includes Walmart’s pharmacies, comparable sales increased 3. Those sales were hit by federal legislation that requires pharmacies to dispense some high-cost Medicare drugs at capped prices, the retailer said. e-commerce business, which has become an engine of growth for the retailer, rose 24%, trailing the first-quarter pace of 26%.