What are Outliers in SQL for Data Analysis?
When working with actual sales and marketing data, the truth is, not all behaviors are normal. Most...
Tag: SQL
SQL for Time-Series Analysis | Moving Averages and Lag/Lead
When we analyze trends in data analysis, we often work with values that change over time. Website t...
What Are Window Functions in SQL?
When we move deeper into data analysis using SQL, we quickly realize that basic queries with SELECT...
How to Select Specific Columns in SQL?
When you start learning SQL, one of the first habits you pick up is using SELECT *. It works, and i...
ETL Using SQL | Transforming Data with Real Queries
When you start learning data analysis, SQL often feels like a powerful but slightly intimidating to...
Top 10 Database Interview Questions for Aspiring Data Analysts
Walking into a data analyst interview can feel exciting and a little daunting. While you’re prepari...
How to develop a secure PHP Login System (Complete Guide)
Building a secure login system in PHP isn't just about checking if someone typed in the right usern...
SQL for Data Analysis: Queries, Joins, and Real-World Examples
When you step into the world of data analysis, SQL quickly becomes one of your most powerful tools....
Data Cleaning Basics: Techniques Every Analyst Must Know
Here's the truth about data projects: the first thing you'll run into is messy data. Every single t...
Levels of Measurement in Data Analysis: Nominal to Ratio Data
When you and I start analyzing any dataset, it's not enough to know the type of data—we also need t...