Invited Article Foreword

The Invited Article section of this issue consists of the article “Worst-Case Optimal Join Algorithms” by Hung Q. Ngo, Ely Porat, Christopher Ré, and Atri Rudra, which won the best paper award at the 35th Annual ACM SIGMOD/PODS International Conference on Management of Data (PODS’12). We would like to thank the PODS’12 Program Committee for their help in selecting this invited work, and we also thank editor Phokion Kolaitis for handling the paper.