Add papers for federated database (#129)

materials/paper_list/FL-Database/README.md

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-The paper list goes here.
+# Federated Database
+
+# 2022
+| Title                                                        | Venue      | Link                                        |
+| ------------------------------------------------------------ | ---------- |---------------------------------------------|
+ | Conjunctive Queries with Comparisons | SIGMOD | [pdf](https://www.cse.ust.hk/~yike/CQC.pdf) |
+ | R2T: Instance-Optimal Truncation for Differentially Private Query Evaluation with Foreign Keys | SIGMOD | [pdf](https://www.cse.ust.hk/~yike/R2T.pdf)                                     |
+
+# 2021
+| Title | Venue | Link | 
+| --- | --- | --- |
+ | Approximate Range Counting Under Differential Privacy | SOCG | [pdf](https://drops.dagstuhl.de/opus/volltexte/2021/13844/pdf/LIPIcs-SoCG-2021-45.pdf) |
+ | Weighted Distince Sampling: Cardinality Estimation for SPJ Queries | SIGMOD | [pdf](https://dl.acm.org/doi/abs/10.1145/3448016.3452821) |
+ | Residual Sentivity for Differentially Private Multi-way Joins | SIGMOD | [pdf](https://dl.acm.org/doi/abs/10.1145/3448016.3452813) |
+
+# 2020 
+| Title | Venue | Link | 
+| --- | --- | --- |
+| Collecting and Analyzing Data Jointly from Multiple Services under Local Differential Privacy | VLDB | [pdf](https://dl.acm.org/doi/abs/10.14778/3407790.3407859) | 
+| Improving Utility and Security of the Shuffler-based Differential Privacy | VLDB | [pdf](https://arxiv.org/abs/1908.11515) |
+
+# 2019 
+| Title | Venue | Link |
+| --- | --- | --- |
+| Answering Multi-dimensional Analytical Queries under Local Differential Privacy | SIGMOD | [pdf](https://dl.acm.org/doi/abs/10.1145/3299869.3319891) |