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TL;DR Dolt is a SQL database with built-in Git versioning, branching, and distribution semantics that makes collaborating on and distributing data effortless. What Git does for files, Dolt does for data. …

Dolt is Git for data. It's a SQL database that lets you clone, branch, diff, merge, and fork your data just like you can with a filesystem tree in Git. This blog post explores one of the fundamental datastr…

Dolt is Git for data. Instead of versioning files, Dolt versions tables. DoltHub is a place on the internet to share Dolt repositories. As far as we can tell, Dolt is the only database with branches. How would…

Overview In this blog post, we discuss an approach for simulating an outbreak of COVID-19 in the US Congress. This is a long technical article about data sets, epidemiology, and simulation. Feel free t…

In the previous article in this series, we took a deep look at the overall system architecture of DoltHub, the online data community powered by the Dolt version-controlled database. In this article, we'll zoom…

We adopted Bash Automated Testing System (Bats) to test the Dolt command-line. As of March 10, 2020 we are up to 473 tests, though 55 are skipped because they currently fail. The tests define desired behavior …

Dolt is Git for data. It's a SQL database that lets you branch, merge, and fork your data just like you would a Git repository. In previous blog posts we announced how you can use special system tables to q…

Here at DoltHub, we've been working on COVID-19 data since February 5, 2020. First, we started importing John Hopkins data and then we worked on assembling the largest open, regularly-updated set of case detai…

As part of our effort to track data related to the Novel Coronavirus (COVID-19), we wanted to scrape a JavaScript-enabled website on Coronavirus from Hong Kong. Moreover, you'll notice that the website from Ho…

On Saturday, February 29, this transpired in our company chat room: Tim/Brian Google Chat Snippet A project was born. We had time series data for confirmed cases, deaths, and recoveries segmented by l…

In our introductory article for this series, we took a high-level look at the technology stack and architecture behind DoltHub, the online home for Dolt data repositories. In this article, we'll delve a little…

In this blog post I want to give an introduction to some core concepts used to implement fast querying of databases. These techniques were implemented in Dolt and produced significant performance improvements…

Dolt is Git for Data. Learn about the options for versioning data catalogs, data pipeline version tools, and version controlled databases. The Dolt database versions data and schema with full audit history, di…

In the first part of this two part blog I covered NOAA's "Global Hourly Surface Data" dataset and how it is modeled in Dolt. Dolt is git for data, and for this dataset we model a day of observations as a si…

The National Oceanic and Atmospheric Administration, NOAA, publishes weather measurements taken from stations around the world. It started in 1901 with a handful of stations, and there are more than 35,000 st…

Dolt is Git for data. We built Dolt to help teams collaborate on data sets using the forking, branching, and merging workflows that Git popularized. These workflows are what enable software engineers to co…

In our previous blog post we examined some freely available licensing tools for open data from Creative Commons. To briefly recap a license specifies the terms under which copyrightable material is made availa…

Introduction Dolt is a data format. DoltHub is a collaboration platform for data stored in the Dolt format. When sharing copyrighted content the terms of that sharing are governed by a license. In this post…

John Hopkins University Center for Systems Science and Engineering began collecting, tabulating, and publishing Novel Coronavirus (COVID-19) data on January 31, 2020. We started importing this dataset into Dol…

Towards the end of last month, we launched a totally reworked and redesigned version of DoltHub, our web application for hosting and collaborating on Dolt repositories. Now that we've had a little while to iro…