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Results tagged with relational-theory
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user 73183
On this site this tag applies to questions about Relational Model theory. The Relational Model for database management is an approach to managing data using a structure and language consistent with first-order predicate logic. In the Relational Model of a database, all data is represented in terms of tuples, grouped into relations. A database organized in terms of the Relational Model is a relational database.
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Attributes in relation after cross product
I have a question regarding the resulting attributes in the cross product of two relations in relational algebra...
Generally, the cross product will result in a relation whose attributes is the sum …
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Select all from A where attribute exists in B [closed]
I have a question involving relational algebra. Suppose I have two relations A and B, where B has a foreign key that references A.
Using relational algebra, how do I select all tuples from A where var …
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Primary key in resulting relation from union operation in relational algebra
I have a question regarding the resulting table/relation from a union operation in relational algebra. Does the resulting relation not have a primary key? Or does it return a table with a hidden prima …
- 415
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How to find functional dependancies from simply looking at a relational schema?
If only given a schema (table header, with primary key indicated), how do I find functional dependencies?
My problem is that functional dependencies are determined in terms of the data stored in the …
- 415