Cross-DB Join

Aikesheng Open Source Community

Apr 17, 2019 · Databases

SQL Refactoring Guide Based on Distributed Middleware

This article explains how distributed middleware processes simple SQL, ER‑based joins, and cross‑database joins, analyzes their performance impacts, and provides practical recommendations for optimizing SQL statements by using shard conditions, limiting clauses, low‑cardinality columns, and table ordering.