A gaps and islands problem refers to a situation where there is a sequence of rows in a table that should appear at some regular intervals (daily measures of temperature, weekly summary of sales, e...

AWS Glue is a fully managed ETL (Extract, Transform, Load) service that helps you prepare and organize data for analytics. Acting as both a data catalog and a transformation engine, Glue brings str...

CTEs vs. Temporary Tables – Which One Should You Use? Both Common Table Expressions (CTEs) and temporary tables allow you to work with intermediate data inside a query, but they behave differently ...

The first step in every statistical analysis is to determine whether the data is a population or a sample. A population is the entire set of all possible data values that are of interest in a study...

Text processing and manipulation are essential steps in data cleaning and preparation. Machine learning models that rely on text — such as sentiment analysis, language translation, spam filtering, ...

This tutorial uses Oracle SQL syntax but the concepts are universal. Joins are the heart of relational databases — they let you combine information stored in different tables into one coherent res...

Data Science: Turning Data Into Insights Data Science is all about extracting insights from data. It’s about uncovering hidden information that helps organizations make smarter decisions. In a wor...