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The Holistics Blog

Business Intelligence for Practitioners

Data at Work Startups Business Intelligence

How To Interview A Data Analyst Candidate

How do you usually interview a data analyst candidates? In this article, I'll share some of the guidelines and areas you can focus on when interviewing a data analyst candidate. These serve as pointers to aid with your interview.

Huy Nguyen February 10, 2018
Data at Work Business Intelligence

Data Lake vs Data Warehouse vs Data Mart

The term "Data Lake", "Data Warehouse" and "Data Mart" are often times used interchangbly. But what …

Jatin Raisinghani February 06, 2018
Engineering Inner Join

How We Built A Job Queue System with PostgreSQL & Ruby For Our B2B SaaS Application

Why and how we built a multi-tenant job queue system for our B2B SaaS Application with PostgreSQL and Ruby

Huy Nguyen January 24, 2018
Lean Analytics Data at Work Business Intelligence

ETL vs ELT: How ELT is changing the BI landscape

In any organization’s analytics stack, the most intensive step usually lies is data preparation: combining, cleaning, and creating data sets that …

Ragha Vasudevan December 20, 2017
Lean Analytics Business Intelligence

Understanding Your Average Customer Value Over Time (CVO)

As business owners, understanding your customers’ behaviour is among the key things that will help you grow your business. If you’re …

Huy Nguyen November 24, 2017
Lean Analytics Business Intelligence

4 Ways to Improve Dashboard Performance

A common problem that data analysts and report users face is slow dashboards, making users wait for charts and reports to load. …

Ragha Vasudevan November 15, 2017
Lean Analytics Business Intelligence

Knowing Your Key Metrics

In his early days of investing, Warren Buffett drove to the airport at Omaha to pick up David Strassler, a New York based businessman whose family bought and fixed distressed companies.

Ragha Vasudevan November 08, 2017
Lean Analytics Business Intelligence

Quick Guide: Calculate Cohort Retention Analysis with SQL

Cohort Retention Analysis is a powerful thing that most business owners need to look at. In this post, I'm going …

Huy Nguyen October 30, 2017
Lean Analytics Engineering Business Intelligence

Useful PostgreSQL Queries For Monitoring Purpose

Below are some useful Postgres queries for both troubleshooting, monitoring and analytics purpose. Note: if you're looking for a simple …

Huy Nguyen October 29, 2017
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