Oscar Romero

A software tool for e-assessment of relational database skills

2016 · International journal of engineering education

The objective of this paper is to present a software tool for the e-assessment of relational database skills. The tool is referred to as LearnSQL (Learning Environment for Automatic Rating of Notions of SQL). LearnSQL …

Configuring Parallelism for Hybrid Layouts Using Multi-Objective Optimization

2020 · Big Data

Modern organizations typically store their data in a raw format in data lakes. These data are then processed and usually stored under hybrid layouts, because they allow projection and selection operations. Thus, they allow (when …

Scalable Data Discovery Using Profiles

2020 · arXiv (Cornell University)

We study the problem of discovering joinable datasets at scale. This is, how to automatically discover pairs of attributes in a massive collection of independent, heterogeneous datasets that can be joined. Exact (e.g., based on …