在MySQL中，查询条件使用 IS NULL 或 IS NOT NULL ，理论上都会走索引。部分不走索引的情况也是因为优化器判断全表扫描的效率要高于使用索引，才导致放弃使用索引，而这与查询条件为 IS NULL 或 IS NOT NULL 本身没有直接关系，只和执行 ...

The rarest blood type is called Rh null, and fewer than 100 people in the world have it. People with Rh null blood do not have any Rh antigens and can face health issues like fragile red blood cells.

Abstract: In the context of incremental learning, a network is sequentially trained on a stream of tasks, where data from previous tasks are particularly assumed to be inaccessible. The major ...

这项由上海交通大学的周维、清华大学的李国良、以及字节跳动的王昊宇、韩宇星团队共同完成的研究，发表于2025年9月的计算机科学数据库领域（arXiv:2509.23338v1），为解决企业数据库系统间的SQL语言转换难题提供了突破性方案。有兴趣深入了解 ...

一句话核心价值点：用10行SQL让乱糟糟的文本数据秒变标准格式，小白也能轻松搞定！

2025-06-10: We implemented a tool-call-based Spider-Agent for Spider 2.0-Snow that requires no Docker and significantly improves runtime performance. The questions/instructions are in ...

Jackson Version 3.0 is a Major New version, released on October 3, 2025. It had been in development since late 2017. Multiple Release Candidates were published before official 3.0.0. 3.0 is a major ...

这是苍何的第 445 篇原创！ 大家好，我是刷 GitHub 停不下来的苍何。 刷了很久的 GitHub，发现个有意思的开源项目。 看了下，这是京东开源的 joycode-agent，目前在 SWE-Bench Verified 基准测试中凭借 74 ...

Adam Hayes, Ph.D., CFA, is a financial writer with 15+ years Wall Street experience as a derivatives trader. Besides his extensive derivative trading expertise, Adam is an expert in economics and ...

Adam Hayes, Ph.D., CFA, is a financial writer with 15+ years Wall Street experience as a derivatives trader. Besides his extensive derivative trading expertise, Adam is an expert in economics and ...