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FAQ: Questions Asked Frequently

Summary: Defines FAQ, a unifying formalism for CSPs, PGMs, matrix ops, joins and logic, and presents InsideOut, a variable-elimination algorithm that leverages fractional edge covers and worst-case optimal join techniques. Characterizes semantically equivalent variable orderings and gives a polytime approximation to minimize fractional FAQ-width. (summarized by gpt-5-mini on Feb 09 2026)

Paper ID
hecc65d24f57dba00
Venue
PODS
Year
2016
Pagerank
0.00020020639
Overall Rank
357 | 97.61%
DOI
10.1145/2902251.2902280

Incoming Non-self Citations Over Time

Authors

BibTeX Citation

@inproceedings{khamis_pods16,
        address = {New York, NY, USA},
        series = {{PODS} '16},
        title = {{FAQ: Questions Asked Frequently}},
        url = {https://dl.acm.org/doi/10.1145/2902251.2902280},
        doi = {10.1145/2902251.2902280},
        booktitle = {Proceedings of the {ACM} {SIGMOD} Symposium on {Principles} of {Database} {Systems}},
        publisher = {Association for Computing Machinery},
        author = {Khamis, Mahmoud Abo and Ngo, Hung Q. and Rudra, Atri},
        year = {2016}
}

Incoming Citations (Sorted by Pagerank)

Showing 50 of 77 citing papers.

Rank Citing Paper Year Venue Pagerank
208 EmptyHeaded: A Relational Engine for Graph Processing 2016 SIGMOD 0.00024884544
315 Worst-Case Optimal Join Algorithms: Techniques, Results, and Open Problems 2018 PODS 0.00021246
521 Learning Linear Regression Models over Factorized Joins 2016 SIGMOD 0.00016929744
812 The Dynamic Yannakakis Algorithm: Compact and Efficient Query Processing Under Updates 2017 SIGMOD 0.00013729015
818 Hypertree Decompositions: Questions and Answers 2016 PODS 0.0001366708
1,091 What do Shannon-type Inequalities, Submodular Width, and Disjunctive Datalog have to do with one another? 2017 PODS 0.00012074152
1,249 Distributed Evaluation of Subgraph Queries Using Worst-case Optimal Low-Memory Dataflows 2018 VLDB 0.00011340141
1,255 Data Management in Machine Learning: Challenges, Techniques, and Systems 2017 SIGMOD 0.00011325762
1,570 AJAR: Aggregations and Joins over Annotated Relations 2016 PODS 0.0001020855
1,596 Adopting Worst-Case Optimal Joins in Relational Database Systems 2020 VLDB 0.00010127607
2,299 On Functional Aggregate Queries with Additive Inequalities 2019 PODS 8.6727773e-05
2,591 Optimal Algorithms for Ranked Enumeration of Answers to Full Conjunctive Queries 2020 VLDB 8.2468757e-05
2,630 Convergence of Datalog over (Pre-) Semirings 2022 PODS 8.2027684e-05
2,663 A Layered Aggregate Engine for Analytics Workloads 2019 SIGMOD 8.1581558e-05
2,975 In-Database Learning with Sparse Tensors 2018 PODS 7.7907759e-05
3,112 Incremental View Maintenance with Triple Lock Factorization Benefits 2018 SIGMOD 7.6357579e-05
3,187 Trade-offs in Static and Dynamic Evaluation of Hierarchical Queries 2020 PODS 7.5546613e-05
3,330 SPOOF: Sum-Product Optimization and Operator Fusion for Large-Scale Machine Learning 2017 CIDR 7.4173693e-05
3,570 Attacking Diophantus: Solving a Special Case of Bag Containment 2019 PODS 7.1977783e-05
3,992 Guaranteeing the O~(AGM/OUT) Runtime for Uniform Sampling and Size Estimation over Joins 2023 PODS 6.8685334e-05
4,161 The Relational Data Borg is Learning 2020 VLDB 6.7700593e-05
4,330 MNC: Structure-Exploiting Sparsity Estimation for Matrix Expressions 2019 SIGMOD 6.6595681e-05
4,752 Optimal Join Algorithms Meet Top-k 2020 SIGMOD 6.434561e-05
4,974 SPORES: Sum-Product Optimization via Relational Equality Saturation for Large Scale Linear Algebra 2020 VLDB 6.3318399e-05
5,289 Tensor Relational Algebra for Distributed Machine Learning System Design 2021 VLDB 6.1940481e-05
5,595 Cover or Pack: New Upper and Lower Bounds for Massively Parallel Joins 2021 PODS 6.0727701e-05
5,601 HyperBench: A Benchmark and Tool for Hypergraphs and Empirical Findings 2019 PODS 6.0706976e-05
5,902 Yannakakis+: Practical Acyclic Query Evaluation with Theoretical Guarantees 2025 SIGMOD 5.9536872e-05
6,018 A Query Language Perspective on Graph Learning 2023 PODS 5.9129763e-05
6,044 Topology Dependent Bounds For FAQs 2019 PODS 5.9055665e-05
6,229 The Fast and the Private: Task-based Dataset Search 2024 CIDR 5.8444773e-05
6,264 General and Fractional Hypertree Decompositions: Hard and Easy Cases 2018 PODS 5.8308708e-05
6,429 Evaluating Datalog over Semirings: A Grounding-based Approach 2024 PODS 5.7884926e-05
6,467 Output-sensitive Conjunctive Query Evaluation 2024 PODS 5.7747248e-05
6,531 Query Evaluation by Circuits 2022 PODS 5.754708e-05
6,545 Ranked Enumeration of Join Queries with Projections 2022 VLDB 5.7515992e-05
6,550 JoinBoost: Grow Trees Over Normalized Data Using Only SQL 2023 VLDB 5.7503043e-05
6,573 Output-Optimal Algorithms for Join-Aggregate Queries 2025 PODS 5.7455776e-05
6,589 Mining Approximate Acyclic Schemes from Relations 2020 SIGMOD 5.7427998e-05
6,805 Instance-Optimal Acyclic Join Processing Without Regret: Engineering the Yannakakis Algorithm in Column Stores 2025 VLDB 5.6780394e-05
6,876 Insert-Only versus Insert-Delete in Dynamic Query Evaluation 2024 PODS 5.6586279e-05
7,292 Computing the Difference of Conjunctive Queries Efficiently 2023 SIGMOD 5.5642569e-05
7,338 Space-Time Tradeoffs for Conjunctive Queries with Access Patterns 2023 PODS 5.5491953e-05
7,435 Efficient Computation of Quantiles over Joins 2023 PODS 5.5283535e-05
7,439 A Nearly Instance-optimal Differentially Private Mechanism for Conjunctive Queries 2022 PODS 5.5267455e-05
7,917 Avoiding Materialisation for Guarded Aggregate Queries 2025 VLDB 5.4276002e-05
8,073 Tight Bounds of Circuits for Sum-Product Queries 2024 PODS 5.3942942e-05
8,081 Saibot: A Differentially Private Data Search Platform 2023 VLDB 5.3942942e-05
8,393 Efficient Distributed Hop-Constrained Path Enumeration on Large-Scale Graphs 2024 SIGMOD 5.3410533e-05
8,682 Galley: Modern Query Optimization for Sparse Tensor Programs 2025 SIGMOD 5.2905577e-05
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Outgoing Citations (Sorted by Pagerank)

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