Visio Professional and Premium editions support the reverse engineering features for the Database Model Diagram template (that is, using an existing database to create a model in Visio) but it does not support forward engineering (that is, using a Visio database model to...
That's not quite pleasant work, and the DBMS can't do it for you (there is no NOT NULL IF another_field = value column constraint in SQL or anything like this). Go with two tables. It's easier to support. I once saw a DB where everything, every single piece of data went in j...
An ER model (schema/diagram) for the data you have in your schema would have User, Admin & Comment entities, a Posts relation on users and comments and a Reports relationship on users and comments, which could be considered a Report associative entity. As to variations, including...
a克隆技术对保护物种,特别是珍稀、濒危物种来讲是个福音。 正在翻译,请等待...[translate] aIn database jargon, a(n) relationship is an association between data that is stored in different record types. 在数据库专科术语, a (n)关系是一个协会在被存放用不同的记录类型的数据之间。[translate]...
A versioned data management system is provided with a method for resolving sources and targets of relationships. For each entity instance, a lifetime ID is recorded. When the add interface is used to add an entity, a value is assigned to the lifetime ID, which value has never been used ...
DERIVING SYSTEM FOR CAUSAL RELATIONSHIP BETWEEN DATA AND DERIVING METHOD FOR CAUSAL RELATIONSHIP IN DATABASE 来自 百度文库 喜欢 0 阅读量: 2 申请(专利)号: JP特願平11-97458 申请日期: 19990405 公开/公告号: JP特開2000-288877(P2000-288877A)A ...
Youcanquicklyaddtoadatabasediagramallofthe tables that are involvedinarelationshipwithaselectedtable. 您可以将关系中与选定表相关的所有表快速添加到数据库关系图中。 technet.microsoft.com 8. Iftheyalreadyareinarelationshipwithyou,theydon'tneedsocialproofortestimonialsorbeforeandafterphotos. ...
In an Access database, you create a table relationship using one of the following methods: In the Relationships window, add the tables that you want to relate, and then drag the field to relate them from one table to the other table. ...
LATEST : The version of the metadata corresponds to the database version. version_string : A specific database version (for example, 11.1.0). In Oracle Database 11g, this value cannot be lower than 9.2.ImportSpecifies the version of database objects to be imported. The VERSION parameter sim...
B Hill,J Long,A Whitefield - 《Behaviour & Information Technology》 被引量: 26发表: 1997年 Enriched Relationship Processing in Object-Relational Database Management Systems Examining the integration of an object-oriented application and an OR-SQL schema, (=-=Zhang and Ritter 2001-=-) identify ...