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1 week ago | 
hackernoon.com | Luca Liu
IntroductionEfficient SQL queries are essential for optimal performance in Oracle databases. This article focuses on key practices for query optimization, with practical examples tailored for Oracle environments. 1. Use Indexes EffectivelyIndexes are a powerful tool in Oracle for speeding up data retrieval. Oracle supports various types of indexes, including B-Tree, Bitmap, and Function-Based Indexes.
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1 week ago | 
hackernoon.com | Luca Liu
IntroductionSQL is not just about querying data—it also includes powerful commands to modify data within tables. These Data Manipulation Language (DML) commands, such as INSERT, UPDATE, and DELETE, enable you to add, modify, or remove rows in a database. In this article, we’ll explore these commands with practical examples. Sample Table: EmployeesLet’s start with a sample Employees table to demonstrate the examples:1.
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1 week ago | 
hackernoon.com | Luca Liu
In modern database development, tools like DataGrip make transaction handling easier by providing graphical interfaces to commit, rollback, or set savepoints. In this article, we’ll define COMMIT, ROLLBACK, and SAVEPOINT in SQL and demonstrate how to implement these transaction controls when working with Oracle, MySQL, or PostgreSQL in Python. Key Transaction Concepts1. COMMIT• Definition: Finalizes a transaction, making all changes permanent in the database.
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1 week ago | 
hackernoon.com | Luca Liu
Recursive queries in SQL, enabled by Common Table Expressions (CTEs), allow us to work with hierarchical or recursive data structures such as employee-manager relationships, family trees, or file directories. This article introduces the WITH clause and demonstrates how recursive CTEs can simplify these operations. What is a Common Table Expression (CTE)?
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1 week ago | 
dev.to | Luca Liu
Do You Really Need a “Second Brain”? In a world overflowing with information, tools, and apps, the concept of a “second brain” keeps coming up—a system to store our thoughts, ideas, and tasks. Apps like Notion, Evernote, or Obsidian promise to organize our lives and boost productivity. But which one is the best for you? And how can you even decide?
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Feb 14, 2025 | 
dev.to | Luca Liu
Database design is a critical step in creating efficient, scalable, and maintainable systems. Two fundamental concepts in database design are normalization and denormalization, which balance the trade-offs between reducing redundancy and optimizing performance. In this article, we’ll explore these concepts, their applications, and examples of when to use each.
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Jan 21, 2025 | 
hackernoon.com | Luca Liu
IntroductionIn recent years, Large Language Models (LLMs) have revolutionized the way we generate text and assist with tasks such as writing, research, and more. One popular LLM is LLaMA (Large Language Model Application), which can be used to enhance the capabilities of your favorite note-taking app, Obsidian. In this article, we will explore how to integrate a local LLM model like LLaMA into Obsidian on a Mac. Why Use Local LLM Models?
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Jan 21, 2025 | 
hackernoon.com | Luca Liu
IntroductionLarge Language Models (LLMs) have revolutionized the way we interact with technology, enabling powerful applications in automation, personal productivity, and learning. While cloud-based LLMs are widely used, local LLMs—models that run directly on personal devices—are now emerging as game-changers for life hackers. They offer unique advantages such as enhanced privacy, offline functionality, and customizable use cases.
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Jan 21, 2025 | 
hackernoon.com | Luca Liu
IntroductionAfter setting up your local LLM model with LM Studio (as covered in my previous article), the next step is to interact with it programmatically using Python. This article will show you how to create a simple yet powerful Python interface for your local LLM. Step 1: Start Your Local LLM SystemBefore running the Python code, ensure your local LLM system is up and running. Most systems expose a RESTful API or a similar interface for interaction.
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Jan 21, 2025 | 
hackernoon.com | Luca Liu
IntroductionSQL is not just about querying data—it also includes powerful commands to modify data within tables. These Data Manipulation Language (DML) commands such as INSERT, UPDATE, and DELETE, enable you to add, modify, or remove rows in a database. In this article, we’ll explore these commands with practical examples. Sample Table: EmployeesLet’s start with a sample Employees table to demonstrate the examples:1.
