bigint is a lightweight C++ library for working with large integers and fractions. It is designed with simplicity in mind, requiring only a single header and a single implementation file.

而在本例中，值得注意的是，c1列的类型是bigint，而SUBSTR函数的返回值却是varchar类型，这可能是问题的根源所在。 进一步分析，我们发现Navicat和GreatSQL命令行的collation_connection设置存在不同：前者默认使用utf8mb4_0900_ai_ci，而后者则是utf8mb4_0900_bin。值得一提的是 ...

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