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- Relation Schema - an overview | ScienceDirect Topics
A relation schema R(A 1,…, A n) describes a relation R of degree n by enumerating the n-attributes A 1,…, A n that characterize R An attribute names a role played by some domain D in describing the entity modeled by R
- Relational Schema - an overview | ScienceDirect Topics
A relational schema (or relational database schema) is a set of relational table definitions, constraints, and perhaps derivation rules You may wish to review Sections 1 3 and 2 3, where the basic ideas were discussed The structure of a single relational table is called a table scheme or relation variable
- Relational schema optimization for RDF-based knowledge graphs
Assuming a design with a “universal” relation (Fig 2 c), the query evaluation over the relational schema (see Section 5 for the details on the SPARQL-to-SQL query evaluation) would require one self-join for each one of the w o r k s F o r, s u p e r v i s e s and i s M a r r i e d T o query conditions (h a s B i r t h d a y and h a s N a t
- Normalized Schema - an overview | ScienceDirect Topics
Figure 2 10 shows a database design with a star schema; it represents some of the data from the sample database (see Figure 1 13) In a star schema the tables are classified as dimension tables (or dimensional tables) and fact tables Here, CUSTOMER, DVD_RELEASE, and DATE form the dimension tables and TRANSACTION forms a fact table
- Relational database schema design for uncertain data
In particular, the downward closure property means that the fewer tuples we consider in a relation the more FDs will satisfy that relation, which illustrates a trade-off between data losslessness (fewer tuples) and data integrity (more FDs that apply) This has two important consequences for the schema design of applications
- Transforming RDB schema into well-structured OODB schema
In this article, we propose the notion of class structure and define well-structured class Based on MVDs, a theorem is given on transforming a relation schema into an equivalent well-structured class In transforming RDB schema into OODB schema, a composition process is proposed to reduce the input RDB schema
- Converting relational database into XML documents with DOM
The author claims that the universe of data to be modeled can be represented by one relation in a relational schema Any relation in the database is a projection of a universe relation Ref [14] presents techniques for converting relational databases into object-oriented databases The data conversion involves unloading tuples of relations
- Orientation-point relation based inspection path planning method for 5 . . .
A valid O-P case means that the point can be inspected by that probe orientation A valid O-P relation schema includes all valid O-P cases The validity of an O-P case is judged by two accessibility criteria which are detailed in Section 2 1, and the detailed algorithm to construct a valid O-P relation schema is given in Section 2 2
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