I am Yunjia Zhang, a Ph.D. candidate majoring in Computer Sciences at Department of Computer Sciences, University of Wisconsin-Madison (Madison, WI, US). Currently, I am in Database Group, under the supervision of Prof. Theodoros (Theo) Rekatsinas (currently at Apple) and Prof. Jignesh M. Patel (currently at CMU). I am also in strong collaboration with Microsoft GSL, and my mentor at GSL is Avrilia Floratou. I got my B.Eng in Computer Science at School of Computer Science, Wuhan University. Previously, I had experience working as research assistant at SKLSE @ Wuhan University (supervisor: Prof.Hao Huang), SCALE @ Nanyang Technological University (supervisor: Prof.Gao Cong) and Database Research Lab @ National University of Singapore (supervisor: Prof.Xiaokui Xiao).

I have a broad interest in many topics in databases. I am devoted to improving the data scientists’ pipeline, providing them with easier-to-use and faster-to-execute analytic tools. I am currently focusing on LLMs for databases and efficient query processing.

Office: 4360 @ CS Dept., 1201 W Dayton St, Madison, WI, United States, 53715

Email: yunjia [AT] cs.wisc.edu


Simple Adaptive Query Processing vs. Learned Query Optimizers: Observations and Analysis [pdf] [code]
Yunjia Zhang, Yannis Chronis, Jignesh M. Patel, Theodoros Rekatsinas
VLDB 2023

Schema Matching using Pre-Trained Language Models [pdf]
Yunjia Zhang, Avrilia Floratou, Joyce Cahoon, Subru Krishnan, Andreas Mueller, Dalitso Banda, Fotis Psallidas, Jignesh M. Patel
ICDE 2023

Can Transfer Learning be Used to Build Query Optimizers [talk]
Yunjia Zhang, Yannis Chronis, Jignesh M. Patel, Theodoros Rekatsinas
CIDR 2022

A Statistical Perspective on Discovering Functional Dependencies in Noisy Data [pdf] [code]
Yunjia Zhang, Zhihan Guo, Theodoros Rekatsinas

Statistical Estimation of Diffusion Network Topologies [pdf] [slides]
Keqi Han, Yuan Tian, Yunjia Zhang, Ling Han, Hao Huang, Yunjun Gao
ICDE 2020


  • Joining Gray System Lab (GSL) at Microsoft Azure Data Research as research intern in summer 2021! [01/27/2021]

  • Our paper on discovering functional dependency from a statistical perspective is to appear in SIGMOD 2020. [03/22/2020]

  • Paper on diffusion network topology resconstruction is accepted by ICDE 2020. [12/13/2019]

  • Joining Database Group of Computer Science Dept. at University of Wisconsin-Madison for Ph.D study. GO BADGERS! [05/13/2019]

  • Attending AAAI 2019 (Jan.27 2019) at Hawaii, USA and giving an oral presentation! [12/13/2018]

  • Joining Prof.Xiaokui Xiao’s Database Research Lab at National University of Singapore from Nov 2018! [10/01/2018]

  • Joining Prof.Gao Cong’s Singtel Cognitive and AI Lab for Enterprises at Nanyang Technological University in Singapore from Jul 2018! [06/29/2018]

  • Paper accepted by National Database Conference 2018 (NDBC 2018)! [04/14/2018]

  • Finished my internship working with Xinhua Fan and Simin Liu under supervision of Prof.Limin Guo at Institute of Software, Chinese Academy of Sciences! [04/14/2018]

  • Joining Prof.Hao Huang’s research lab on data mining from Apr 2017 at School of Computer Science, Wuhan University! [04/02/2017]