Wal-Mart

(WMT) - Get Report

posted a 7.9% increase in June same-store sales and raised its second-quarter guidance.

The No. 1 retailer now expects to earn 44 cents to 45 cents a share, up from the 43 cents to 44 cents it previously forecast. Wal-Mart said same-store sales at its discount stores rose 8.7% in June, while same-store sales at Sam's Club rose 8.7%. Net sales for the five-week period ending July 5 rose 13.8% to $23.347 billion, up from $20.512 billion in year-ago period.

Meanwhile the

Gap

(GPS) - Get Report

posted its customary decrease in same-store sales but said results in all brands were nevertheless "significantly better than expected." The company said June comps dropped 6%, their 27th straight monthly decrease. Total sales for June were $1.32 billion, up 2% from a year ago.

Same-store sales at domestic Gap stores dropped 7% for the month while Gap international dropped 7%. Banana Republic same-store sales were off 6% while Old Navy fell 7%.

Elsewhere in the retail sector,

J.C. Penney

(JCP) - Get Report

said same department store sales fell 0.3% in June, while they rose 6.2% at its Eckerd segment. Penney said it expects its second-quarter loss to be at the narrow side of its previously forecast range of 10 cents to 15 cents a share.

AnnTaylor

(ANN)

said June same-store sales fell 1.2% on reduced discounting. But the company raised its second-quarter earnings forecast to 29 cents to 30 cents a share from 25 cents to 27 cents, citing improved margins.

Limited Brands

(LTD)

posted a 5% increase in June same-store sales, while total sales were up 8% to $858.7 million.

Costco

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posted a better-than-expected 6% same-store sales increase for the month and said total sales rose 11% to $3.86 billion. Analysts were looking for a 5.7% improvement in comps.

Pier 1

(PIR) - Get Report

reaffirmed second-quarter earnings guidance after posting a 7.4% gain in June same-store sales. The company expects profits in a range of 19 cents to 21 cents a share.

Barnes & Noble

(BKS) - Get Report

said June same-store sales rose 0.6%. The company said it was leaving the 10-cent earnings consensus intact because of cost-management efforts.

Dollar General

(DG) - Get Report

said same-store sales rose 11.8% in June and forecast a 15%-18% increase for July. Total sales for the five weeks ended July 5 rose 21% to $573.4 million.