数据库字段导出的相关内容

阿里云文档 2025-06-30

删除不同约束下字段的不兼容场景

本文为您介绍 MySQL 数据库和 OceanBase 数据库 MySQL 租户对于删除不同约束下字段的不兼容场景。

阿里云文档 2025-06-30

修改没有约束的列的字段长度的不兼容场景(MySQL)

本文为您介绍 MySQL 数据库和 OceanBase 数据库 MySQL 租户对于修改没有约束的列的字段长度的不兼容场景。

阿里云文档 2025-04-18

敏感字段加密（rds_encdb）

RDS PostgreSQL提供了rds_encdb插件，用于对查询结果集的敏感列进行加密。同时，通过对数据库账户权限进行设置，相关账户在访问敏感列信息时，仅能获得密文格式的查询结果。

阿里云文档 2025-03-14

在MySQL生态中，修改字段的类型需要使用COPY算法对全表数据进行重建，且重建过程中目标表只能查询数据，不能并发的写入数据。更糟糕的是，COPY算法采用单线程进行全表重建，其效率较低。因此，修改字段类型操作一直是MySQL生态下的痛点问题。为了解决这一问题，PolarDB MySQL版支持秒级修改字段（Instant Modify Column）功能，在修改字段类型时，只需变更表定义信息，无需修...

阿里云文档 2024-11-29

RDS PostgreSQL 秒级加字段DDL最佳实践

本文介绍如何在RDS PostgreSQL中通过设置锁等待超时和自动化重试DDL操作，有效解决在执行添加字段的DDL操作时所遇到的锁阻塞问题，从而减少对业务的影响。

问答 2024-07-03 来自：开发者社区

OceanBase数据库 1000多w的数据量没有大字段可以正常导出导入怎么办？

OceanBase数据库 1000多w的数据量没有大字段可以正常导出导入，350w 有clob 大字段导出失败？open1.8.0.227的jdkhttps://ask.oceanbase.com/t/topic/35609402

问答 2022-04-15 来自：开发者社区

下面mysql数据库中如何根据字段typeid_id 来导出栏目的全部记录？

如下图所示下面这个mysql数据库．我怎么根据字段typeid_id 来导出相当栏目的全部记录？比如我想导出里面typeid_id = 9 typeid_id = 10 , 15, 27 等的全部记录数怎么写sql语句？有导出数据并删除原数据表里相关的记录的sql语句不？我导出的目的是重新建一个表，把导出的数据放在新建的表里．把这个大表分拆成几个小表．多谢

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更新时间 2024-07-04 12:04:40

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