Understanding and Handling NULL Values in SQL
When working with SQL, one of the most confusing concepts for beginners is dealing with NULL values. NULL doesn’t represent
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Normal Forms: 1NF, 2NF, 3NF, and BCNF
Previously, we introduced the concept of normalization vs. denormalization explaining how database designers utilize each approach. Now, let’s dive deeper
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Data Structure Comparison: Normalization vs. Denormalization
When designing a relational database, one of the most important decisions you’ll make is how to structure the data. Should
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Database Constraints: Ensuring Accuracy and Consistency
Constraints are rules applied to columns and tables in a database to enforce data integrity, prevent invalid data, and make
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What Is a Relational Database?
If you’re learning SQL, you’ll hear the term relational database a lot. In fact, SQL was specifically designed to work
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Ranking Window Functions: ROW_NUMBER(), RANK(), and DENSE_RANK()
In a previous post, we introduced window functions to add “group context” without collapsing rows. Now let’s build on that
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Database Relationships: Understanding Cardinality
Before diving into data modeling, it’s important to understand cardinality — one of the foundational ideas in relational databases. Cardinality
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Database Design Schemas: Star, Snowflake, and Galaxy
When working with databases, you might hear the word schema used in different ways. It’s important to know that a
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Database Processing Systems: OLTP vs. OLAP
When people talk about database processing systems, they’re referring to the way a database is designed to handle different types
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