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If slow and steady wins the race, Sam's Club still has a long way to go.

Even so, the warehouse retailer under Walmart Stores Inc. (WMT) - Get Walmart Inc. Report posted a pretty decent second quarter Thursday, Aug. 17, with $14.9 billion in sales in the second quarter ending on July 28—a 2.3% uptick compared to last year. All the while, same-store sales were up 1.4%. Walmart at large saw parallel improvements, reporting second-quarter earnings of $1.08 a share, slightly above the $1.07 a share analysts had predicted.

These numbers are favorable, but still pale in comparison to Costco Wholesale Corp. (COST) - Get Costco Wholesale Corporation Report .

"Ain't no stopping Costco," Telsey analyst Joe Feldman wrote in a report in July, after the company saw 6.2% same-store sales that month.

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Overall, noted the publication 24/7 Wall St., Costco's sales and profits are each about twice Sam's Club's.

But that's not to say Sam's Club is flailing behind, Feldman told TheStreet on Thursday.

"It's been performing better, the stores look better, the operational issues they're working through, they're enhancing the supply chain, and there are things that Costco doesn't do," he said, "like store pickup."

Neither Walmart or Costco could be immediately reached for comment.

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