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.
In this tutorial, we’ll provide you with several peculiarities about the joins syntax in SQL. Not just inner joins, but any type of join. In order to fully understand the code we’ve written, you might want to take a look at the previous tutorial on that subject. Moreover, you can see...
Understanding how to construct relationships between objects using SQL joins is a turning point in the journey of learning SQL. You will also see how to relate SQL tables in practice. We will be working with the “employees” database, so if you haven’t downloaded it, you can...
In this post, we will focus on removing records from a database. This operation is carried out with the SQL DELETE statement. Before reading this tutorial be sure to check out our posts on SQL UPDATE Statement and SQL INSERT Statement. Executing an SQL DELETE...
Installing MySQL This post will be a little technical, a little bit complicated, but very important – we will be installing MySQL Workbench and a MySQL Server. You’ll need both in almost every post of our SQL collection: SQL INSERT Statement, SQL UPDATE Statement, SQL...
What is a Database? For many people, this question is more challenging than it might seem at first. An answer like “a big file where a lot of information is stored” is not satisfactory and would not please potential employers. However, reading this article may help you get a better...
