A missing quote made MySQL scan 7.2 million rows. Here's how EXPLAIN exposed the problem and what it taught us about safe ...

Are you afraid to look at your "end-of-month invoice"?Snowflake's Standard edition costs about $2 per credit, and even the ...

PG与MySQL作为主流开源数据库，设计哲学截然不同，前者是严谨学院派，后者是灵活实干家。视频从底层架构切入，详细对比了MySQL的插件式存储引擎与PG的单一存储机制，并深度解析了两者在MVCC ...

PostgreSQL subqueries allow one SQL query to run inside another, making it possible to solve filtering, aggregation, comparison, and table based problems without writing separate queries. The lesson ...

A newly disclosed PostgreSQL vulnerability, tracked as CVE-2026-6471 and nicknamed PostGREShell, could allow attackers with low-level replication access to execute arbitrary code on database servers.

A critical PostgreSQL vulnerability dubbed PostGREShell could allow low-privileged backup and replication accounts to execute arbitrary code, escalate to database superuser privileges, and establish ...

PostgreSQL has released updates to address a security flaw that allows an account with the REPLICATION attribute to run arbitrary code as the operating-system user running the database server. The ...

Dubbed PostGREShell, CVE-2026-6471 turns low-level replication access into code execution, permanent superuser privileges and a persistent database backdoor. PostgreSQL releases since 2014 contain a ...

A deliberately awkward, ~1,855-object Oracle schema for a fictional multi-country retailer, and a complete lab for putting it through the only currently supported Microsoft path to Azure Database for ...

PostgreSQL CASE statements make it possible to add conditional logic directly into SQL queries, working similarly to IF ELSE statements in programming languages and spreadsheet tools. This tutorial ...