Posts
All the articles I've posted.
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Understanding Slowly Changing Dimensions (SCD) in Data Warehousing
When dealing with data warehouses, handling changes in dimension data over time is crucial. Unlike operational databases where updates are straightforward, data warehouses require preserving
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Modes and Examples of KPIs in Data Analysis Expressions (DAX)
Last Year Comparison When analyzing sales performance, it is often useful to compare the current year's sales with the same period in the previous year. To do this, we create several calculated
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Understanding Surrogate Keys in Databases
When designing relational databases, one crucial decision is how to uniquely identify each record in a table. This is where surrogate keys come into play. Unlike natural keys, which derive from
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Understanding the Relationship Between Database Replication and the CAP Theorem
Introduction Database replication is a fundamental strategy in distributed systems that ensures data is duplicated across multiple nodes. However, when designing a replicated database, one must
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Understanding Pagination vs. Batch Processing in Data Handling
When working with large datasets, developers often face the challenge of efficiently extracting, processing, and managing data. Two commonly used techniques for handling such data efficiently are
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Tracking Daily File Size Changes in SQL
When working with databases that store file metadata, it's often useful to track how file sizes change over time. If you have a table with the following structure: id | timestamp | name_file | size
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Resolving 'index.lock' Issue in Git
When working with Git, you may encounter an error preventing you from switching branches or performing other operations. A common issue is the following: fatal: Unable to create '.git/index.lock':
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Merging Data in PostgreSQL vs. MySQL: How to Handle Upserts
When working with databases, you often need to update existing records or insert new ones based on whether a match is found. In PostgreSQL, this is efficiently handled using the MERGE statement.