sql – ITFROMZERO – Share tobe shared!

JSON_TABLE() in MySQL 8: Converting Nested JSON Data into Relational Tables

By admin July 6, 2026

JSON_TABLE() in MySQL 8 converts JSON arrays into relational rows, enabling standard GROUP BY, JOIN, and aggregate operations. This guide compares it with JSON_EXTRACT and application-side processing, analyzes when to use each approach, with real-world examples including NESTED PATH and inconsistent data handling.

MySQL

Optimizing MySQL Storage: Choosing the Right Data Types to Speed Up I/O and Save RAM

By admin June 26, 2026

Choosing the wrong MySQL data types causes unnecessarily bloated databases, high I/O, and wasted RAM. This article shares real-world experience from a 50GB production database: how to choose correctly between INT/BIGINT, VARCHAR/TEXT, ENUM, and TIMESTAMP to optimize performance right from schema design.

MySQL

MySQL Query Rewrite Plugin: Optimize and Fix SQL Queries Without Touching Your Application Code

By admin May 21, 2026

MySQL Query Rewrite Plugin lets you intercept and modify SQL statements at the database layer without changing any application source code. This guide covers installation, configuration, and practical use cases for production environments.

Database

DuckDB: SQLite for Analytics – Master the Art of Processing Tens of GBs Smoothly on Your Laptop

By admin May 10, 2026

Discover DuckDB – the perfect alternative to Pandas for large-scale data processing on local machines. Learn how to query massive CSV/Parquet files directly and pick up practical performance optimization tips.

Database

Mastering CockroachDB: When a ‘Resilient’ SQL Database Helps You Sleep Better

By admin May 1, 2026

A 2 AM system crash is every developer's nightmare. Discover how to deploy CockroachDB—a distributed SQL database with self-healing capabilities for absolute uptime.

Database

Getting Started with ClickHouse: A High-Performance OLAP Database for Large-Scale Analytics

By admin April 28, 2026

ClickHouse is a columnar OLAP database that lets you analyze hundreds of millions of rows in seconds. This guide covers installation on Linux, choosing the right table engine, importing real-world data, and production deployment tips for DevOps teams.

Database

PostgreSQL FDW: The Ultimate Trick to Query MySQL, MongoDB, and CSV Directly Without ETL

By admin April 28, 2026

Forget complex ETL! A detailed guide on using PostgreSQL FDW to query MySQL, MongoDB, and CSV directly. Speed up multi-source data processing with just a few SQL lines.

Database

PostgreSQL Row Level Security (RLS): Securing Multi-tenant Data at the Core

By admin April 27, 2026

Learn how to configure PostgreSQL Row Level Security (RLS) for fine-grained data protection. An optimal solution for Multi-tenant/SaaS applications with real-world performance optimization tips.

Security

Turning Linux into a Database: Querying and Security Monitoring with osquery

By admin April 21, 2026

Stop struggling with Bash scripts. Learn how to use osquery to query the Linux operating system using SQL, making security monitoring and infrastructure management 10x more efficient.

MySQL

MySQL 8 CTE: A Professional Solution for Hierarchical Data and Recursive Queries

By admin April 21, 2026

A detailed guide on using CTE and Recursive CTE in MySQL 8 to efficiently handle hierarchical data, replace complex Self-joins, and optimize query performance.