Let’s Talk SQL

Let’s Talk SQL

This blog is data science, so we will concentrate on querying databases — a frequent task of a data scientist is to retrieve data that is housed in a relational database.

This is the first post in a series on SQL.

According to an IADSS article* SQL is the second most common skill listed in data science job postings — only python is more common. This makes SQL a core skill for any data scientist, data analyst, or data engineer. So what is SQL and why is it so important to data scientists? This post is meant to be a very basic, high-level overview of what SQL is and why it is important to have this skill if you are pursuing a data career.

Our focus on this blog is data science, so we will concentrate on querying databases — a frequent task of a data scientist is to retrieve data that is housed in a relational database.

What is SQL, and what is a relational database?

Structured Query Language, or SQL, is a programming language used to access and manipulate relational databases. The first step in understanding SQL is to understand what we mean by relational database.

A relational database stores information using data points that are related to one another. These data points are stored in tables.

Let’s say we are working at an online catalog company. For our business to function, at minimum we need to know the products being sold, who they are being sold to, and where they are being shipped. We could make one really large table with each order, the customer, the products, and the address. However, this would lead to a whole lot of duplicative information and we would eventually run out of storage space.

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Introduction to Structured Query Language SQL pdf

SQL stands for Structured Query Language. SQL is a scripting language expected to store, control, and inquiry information put away in social databases. The main manifestation of SQL showed up in 1974, when a gathering in IBM built up the principal model of a social database. The primary business social database was discharged by Relational Software later turning out to be Oracle.

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Introduction to Structured Query Language SQL pdf

SQL stands for Structured Query Language. SQL is a scripting language expected to store, control, and inquiry information put away in social databases. The main manifestation of SQL showed up in 1974, when a gathering in IBM built up the principal model of a social database. The primary business social database was discharged by Relational Software later turning out to be Oracle.

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