由Polardb5.7升级到polardb8.0的过程中，部分SQL报字符集排序规则不一致的问题如何解决？【org.springframework.jdbc.UncategorizedSQLException: Error querying database. Cause: java.sql.SQLException: Illegal mix of collations (utf8mb4_09.....

问答 2024-05-29 来自：开发者社区

云数据库RDS SQL Server 2012支持字符集类型utf8mb4吗

文章 2024-03-14 来自：开发者社区

【问题】Cause: java.sql.SQLException: 不支持的字符集 (在类路径中添加 orai18n.jar): ZHS16GBK

主要问题在使用SpringBoot整合Mybatis操作Oracle数据库的时候，报错信息如下： ### Cause: org.apache.ibatis.executor.result.ResultMapException: Error attempting to get column 'ID' from result set. Cause: java.sql.SQLException...

文章 2023-10-09 来自：开发者社区

【MySQL系列】SQL语句入门（创建删除操作）、字符集和数据类型详解

个人主页：阿然成长日记点击可跳转个人专栏：数据结构与算法C语言进阶不能则学，不知则问，耻于问人，决无长进前言：哈喽，大家好，在上一篇博客中，大致讲解了数据库的相关知识，它的作用、定义、分类等等。从本篇博客开始，将详细讲解关系型数据库MySQL的操作与使用，以及SQL语句的讲解。✉️一、何为安装MySQL所谓的安装MySQL就是给主机...

文章 2023-01-10 来自：开发者社区

数据库语句执行过程理解，存储引擎的学习，字符集的理解，加各种sql数据类型理解介绍加之SQL各种数据查询分析和题目专练（2）

聚合函数介绍, select 聚集聚合查询 (整合一整列字段)语法形式：select 函数名(作用字段) from 表名;解释：查询函数处理指定字段(列)之后的结果:有的时候我们需要整合一列的信息来看，这个时候就可以使用聚合函数，聚合函数就是用于整合一列的数据的count(*) 和 count(指定字段(列))的区别：*....

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