PromQL Got a BOOST: 用 Rust 重写 Prometheus 的查询引擎CHINA CONF 2023 第三届中国 Rust 开发者大会 6.17-6.18 @Shanghai ## PromQL Got a BOOST: 用 Rust 重写 Prometheus 的查询引擎 Ruihang Xia @greptime.com ## I ABOUT ## Ruihang GitHub: waynexia Losing hair at Greptime Wanna distributed) SQL and table model ## I WHY REWRITE Target to be the most powerful drop-in replacement PromQL has a good UX for time-series data And it can be better if combine with SQL RIIR, super cooooooo /3622b4beb64d5780512009caeca5090c/p10_2.jpg) larger dataset more computation resources ## SQL ## SQL is extended introducing the new concept we have just made  ## TiDB Features ## • MySQL-client MySQL-client Load Balancer MySQL Protocol Server MySQL Protocol Server TiDB SQL Layer TiDB SQL Layer Transactional KV Storage KV KV KV KV ### AH. HBase • First things first ☐ Need0 码力 | 34 页 | 526.15 KB | 2 年前3
- The SQL Handbook## SQL HANDBOOK # Table of Contents Preface The SQL Handbook Conclusion ## Preface The SQL Handbook follows the 80/20 rule: learn in 20% of the time the 80% of a topic. In particular, the goal is is to get you up to speed quickly with SQL. This book is written by Flavio. I publish programming tutorials on my blog flaviocopes.com and I organize a yearly bootcamp at bootcamp.dev. You can reach me ## The SQL Handbook • 1. Information systems, data and information • 2. What is a Database? And a DBMS? • 3. Do you always need a database? • 4. Relational Databases • 5. Introduction to SQL • 6.0 码力 | 26 页 | 440.71 KB | 2 年前3
- MYBATIS Dynamic SQLhttp://www.tutorialspoint.com/mybatis/mybatis_dynamic_sql.htm Copyright $ © $ tutorialspoint.com Dynamic SQL is a very powerful feature of MyBatis. It enables programmers to build queries based on write the query using the dynamic SQL. MyBatis uses a powerful Dynamic SQL language that can be used within any mapped SQL statement. Following are the OGNL based Dynamic SQL expressions provided by MyBatis otherwise • trim where, set • foreach ## The if Statement The most common thing to do in dynamic SQL is conditionally include a part of a where clause. For example –
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