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An associative entity is a term used in relational and entity–relationship theory. A relational database requires the implementation of a base relation (or base table) to resolve many-to-many relationships. A base relation representing this kind of entity is called, informally, an associative table. An associative entity (using Chen notation)
Microsoft Access is a database management system (DBMS) from Microsoft that combines the relational Access Database Engine (ACE) with a graphical user interface and software-development tools.
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Most relational database designs resolve many-to-many relationships by creating an additional table that contains the PKs from both of the other entity tables – the relationship becomes an entity; the resolution table is then named appropriately and the two FKs are combined to form a PK. The migration of PKs to other tables is the second ...
Lookup Fields, which get their values by "looking up" some value in a table, have been updated to support multi valued lookups. Many new preset schemata are included. Access can synchronize with Windows SharePoint Services 3.0 and Office SharePoint Server 2007.
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A Data (Entity A) could be Sent (Relationship Name) to a Monitor (Entity B) or a Printer (Entity C) to be shown. In this case, the relationship between the Monitor and Printer at one side and Data at the other side is an Exclusive Relationship. Of course it is assumed that Data could be sent to only one of the targets at a time, not to both.
Relationships can be thought of as verbs, linking two or more nouns. [7] Examples include an owns relationship between a company and a computer, a supervises relationship between an employee and a department, a performs relationship between an artist and a song, and a proves relationship between a mathematician and a conjecture.