SQL is the most in-demand query language in data science for creating, manipulating, and sharing data from relational database management systems. Learn everything you need to become a confident SQL user with our SQL tutorials – from installation and relational database essentials, all the way to mastering SQL keys, joins, and clauses.
Whenever we want to avoid the flood of more information than what we need, the LIMIT statement in SQL can help us out. However, we will be using keywords such as HAVING and WHERE, so if you have no idea what is the difference between the two, check out the linked tutorial. Side note: We will be...
In order to become an advanced data scientist, it is crucial to understand how to manipulate data and use operators in SQL. We will be working with databases, so being familiar with them is essential. Let’s take it to the next level! It’s time to start manipulating and retrieving data...
JOINs - What Are They and Why Are They So Relevant for Data Science? It’s a well-known fact that in data science, people spend most of their time cleaning or preprocessing data. Sometimes as much as 70% of the project’s time may go to reorganizing your data before you can start...
By this point, you should be familiar with the CASE statement (if not, you can check out this tutorial first). However, if you want to become a better business intelligence analyst, learning how to integrate SQL and Tableau is key. Today, the world of programming gives us the chance to use...
In this tutorial, we will use a database called “Sales” to illustrate the concept of relational schemas a little better and introduce you to the SQL primary key. The data will be stored in 4 tables – “Sales”, “Customers”, “Items”, and...
