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Process for providing transitive closure using fourth generation structure query language (SQL)
Process for providing transitive closure using fourth generation structure query language (SQL)
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机译：使用第四代结构查询语言（SQL）提供传递闭包的过程
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摘要
Any existing transitive closure in a database can be found using a method based on standard 4th Generation Structured Query Language (SQL) without non-standard extensions to perform recursion analysis. There are no requirements to stay within a preset number of levels in the database to prevent breakdown as in previous known methods. The method represents each database as a graph and builds path and edge tables which are updated as data, that is verticies and edges, are added or deleted. Since this method uses instructions that are entirely within standard 4GL SQL, it can be used over multiple platforms as long as the platforms are 4GL SQL compliant.
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