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: Data Cleaning
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...
How to do A/B Test Analysis in SQL(Conversion Comparison)
When we work on product or marketing data in data analysis, one common task is comparing two versio...
How to Create Column Alias in SQL for better Query Readability
When we write SQL queries for data analysis, the output often looks technical and unfriendly. Colum...
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 Join Tables in SQL for Multi-Source Data Analysis
When we work with real datasets in data analysis, information rarely comes from a single table. Cus...
How to Use SELECT DISTINCT in SQL to Remove Duplicates
When we start working with real datasets in data analysis, one issue appears very quickly—duplicate...
How to Handle NULL Values in Data Analytics Queries
When we start working with real-world data in data analysis, one thing becomes obvious very quickly...
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 Use Aggregate Functions in SQL for Data Analysis
When we start working with data, individual rows rarely give us meaningful answers. Looking at one ...