After covering aggregation in the previous section, I will now go over one of the most important SQL concepts — joins. Often times, the data we need are not just from one table but instead span over multiple ones. We use joins to combine multiple tables containing common identifiers (i.e…

SQL stands for Structured Query Language, which is one of the most important coding languages to learn especially for Data Scientists and Data Analysts. Its main use case is to query and analyze data from a relational database, which consists of rows (records) and columns (features). …

Alexander Chang

M.S.E Data Science @Johns Hopkins University with a B.S. in Applied Mathematics. Previously @MongoDB, current Data Science Intern @EA

Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store