【问题分类】功能兼容【关键字】YAS-07202、YAS_MY ERROR ，不兼容【问题描述】本项目的架构是hadoop+hive+yashandb 使用崖山数据库，将mysql相关的创建表语句进行初始化同步使用崖山23.3版本兼容mysql数据库，新建表和查询表都出现问题查询报错 mysql> SELECT DISTINCT 'org.apache.hadoop.hive.m....

文章 2024-07-21 来自：开发者社区

MySQL设计规约问题之为什么程序连接不同的数据库要使用不同的账号

问题一：为什么会有超过三个表禁止join的规定？参考答案：超过三个表进行join操作可能导致查询复杂度急剧增加，影响查询性能。同时，多表关联查询时需要确保被关联的字段有索引，以提高查询效率。因此，为了保持数据库查询的高效性，通常规定超过三个表禁止进行join操作。关于本问题的更多回答可点击进行查看： https://d...

文章 2024-07-05 来自：开发者社区

使用MySQL JDBC连接数据库

使用MySQL JDBC连接数据库今天我们将探讨在Java应用中如何使用MySQL JDBC连接数据库。MySQL是一种常用的关系型数据库管理系统，而JDBC（Java Database Connectivity）是Java语言访问数据库的标准接口，它为开发人员提供了与各种关系数据库进行交互的能力。本文将详细介绍如何通过MySQL JDBC驱动程序连接数据库、执行SQL查询和更新操作。...

文章 2024-07-01 来自：开发者社区

MySQL数据库——概述-MySQL的安装、启动与停止和客户端连接、关系型数据库（RDBMS）、数据模型

概述（1/2）目前主流的关系型数据库管理系统有：Oracle、MySQL、Microsoft SQL Server、SQLite等等，他们都是由SQL这门语言来统一标准的。总结数据...

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