How to Use Window Functions for Totals and Ranks in SQL
When we move beyond basic SQL in data analysis, we often reach a point where simple GROUP BY querie...
Tag: SQL Functions
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 Use LIMIT and TOP to Sample Large Datasets
When we work with real datasets in data analysis, tables can quickly grow into thousands or even mi...
How to Group Data with GROUP BY for Summary Reports
When we work with raw data, everything often looks overwhelming. Thousands of rows, repeating value...
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....
Types of Data Analysis and When to Use Each One
When you and I talk about data analysis, we're really talking about different methods we use to und...
Query Optimization in SQL: Techniques and Best Practices
When I first started writing SQL queries, I honestly only cared about getting the correct output. I...
Database Normalization: From Messy Tables to Perfect Structure
When I built my first database years ago, I thought keeping everything in one big table was the eas...
SQL Aggregate Functions: Summarize, Count, and Analyze Data
If you work with databases, you often need to turn large amounts of data into useful numbers. SQL a...