My Blog Posts

Python project with my own Netflix data

After gaining proficiency in Python through learning and practice, I decided to embark on my own project using my personal data. Lately, it…

Posted on

Python with Docker and Anaconda

As I was working for BI analyst already for some time, I have realized the importance of learning Python programming language, given its…

Posted on

What type of Average do you prefer?

We often hear phrases like: On average, an average person, average salary, average temperature, and so on. But what average exactly are we…

Posted on

Grouping data with IF and CASE

There are 2 effective tools when we need to group our data or to entitle new value. IF function The IF() function returns a value if a…

Posted on

Temporary table

A temporary table stores data within the database session, in which it was created. When the session is ended, the dataset is…

Posted on

Subqueries and JOIN functions

Subquery is a statement that appears inside another query statement. It is also called an inner or nested query. The inner query executes…

Posted on

SQL queries, ABC

The simplest query in SQL looks like this: If we want to group our column results or to order them in alphabetical or numerical order, then…

Posted on

First queries in BigQuery

As soon as we are logged in, in the Navigation menu (upper left corner), under the BigQuery we need to choose SQL Workspace. And that’s…

Posted on

Database, what is it?

Every beginner in data analysis comes to the idea that it is impossible to work like this. It is impossible to work without access to a…

Posted on

Functions for analysing data in Excel

There are a huge amount of useful functions in Excel, that will cover almost every need. In addition to the functions, I have already…

Posted on

Tools for analysing data in Excel

Excel offers a wide range of tools for data analysis. I want to tell you shortly about my favorite, as I found it the most convenient and…

Posted on

Visuals for data quality

Let’s say, we have a dataset with a list of managers and the number of clients they manage. There are several ways to check the column with…

Posted on

Changelog

Documentation is not what everyone likes, but what almost everyone needs. Especially data analysts. Working with data implies responsibility…

Posted on

Working with .csv files in Excel

As I was learning, I've often encountered files with a .csv extension. There is one quick and effective way to work with them more…

Posted on

Cleaning Dataset with Excel

SQL is of course the sophisticated tool for data cleaning and analysis, but do not underestimate Excel. There are so many cases when the…

Posted on

Clean data is good data

What should we do as soon as we get the data for analysis? We need to check it on 3 points: Data is relevant and can answer our question or…

Posted on

Population vs Sample

Let's imagine, we work on a people-management project. We need to know, how satisfied our company’s employees are and what they think about…

Posted on

Data modelling techniques

First of all, what is the Data model? Data model - is a model that is used for organizing data elements and how they relate to one another…

Posted on

Types of Data

You can find a lot of different Data types browsing the Web. I want to write about some of them. First of all, we divide data into…

Posted on

your File Name Convention

I am sure that everyone has had at least one such case when you open your computer and cannot find that "Untitled" file that you need so…

Posted on

Data is not important in itself

Data is everywhere around us. It is in our smartwatches, GPS trackers, posts on Instagram, or reviews on Google. The amount of it is huge…

Posted on

Hi there!

My name is Maryna, and I'm going to write here about tips and insights that I have recently learned. After almost 7 years of being a…

Posted on

Maryna Demchenko's website. I use this website to share my experience of becoming a data analyst.

Copyright © 2021

This website is built with GatsbyJS and Bulma