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函数索引的奇妙之旅:破解GreatSQL客户端的使用之谜
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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