Database migration from MySQL or PostgreSQL to domestic alternatives like KingbaseES often encounters hidden SQL compatibility issues. This article details nine categories of such traps, including differences in NULL handling, implicit type conversion, and join semantics. Each trap is illustrated with real-world examples and debugging strategies. For engineering teams in China undergoing database localization, understanding these pitfalls is critical to avoid data integrity issues and performance regressions. The content is based on practical experience and offers actionable advice for migration planning and testing.
A deep dive into nine subtle SQL incompatibilities that cause different results despite full syntax compatibility during database migration.