Databases and SQL Interview Questions Cheat Sheet

On Databases

The scale of data on this planet (and beyond) is impossible to imagine. But ever wondered how this data is kept and processed? Well, the answer is obvious in our world of software-- it's databases.

A database is a system used to save and process data in an efficient manner. The way it stores information is usually in a well organized structure, and we can easily manipulate this data according to our requirements.

For example, let’s say we have some facts about a classroom. This information consists of things like student names, subject names, attendance, among other things. How are you going to organize these details?

If you're the school administrator, you'll probably use a spreadsheet, or some other tabular grid or table. You'd insert every student’s information in its own respective row and column. Databases work in the same way. We have tables in which we store our facts, and lean on several techniques to make the processing and utility of this information better.