sql2k数据库约束的相关内容

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 2025-06-30

修改不同约束下的列的字段长度的不兼容场景

本文为您介绍 MySQL 数据库和 OceanBase 数据库 MySQL 租户对于修改不同约束下的列的字段长度的不兼容场景。

阿里云文档 2025-06-30

修改没有约束的列的字段类型的不兼容场景(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类型的不兼容场景。

阿里云文档 2023-09-03

什么是约束？有哪些基本概念_云原生数据库PolarDB PostgreSQL版（兼容Oracle）_云原生数据库 PolarDB(PolarDB)

本文介绍了约束的相关内容。

文章 2022-02-16 来自：开发者社区

SQL2K数据库开发十一之表操作创建UNIQUE约束

1.在数据库关系图中右击表Products,然后从弹出的菜单中选择“属性”命令。或者点击工具栏上的属性图标。 2.或者展开sample数据库，在表Products上右击鼠标，在弹出的菜单中选择“设计表”命令，进入表设计器。 &...

文章 2022-02-16 来自：开发者社区

SQL2K数据库开发十二之表操作创建CHECK约束

1.启动企业管理器，展开数据库sample，选取“表”节点，在表Products上右击鼠标，在弹出的菜单中点击“设计表”选项。 2.在出现的表设计面板的空白处右击鼠标，在弹出的菜单中点击“CHECK约束”选项。 &n...

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