Entity-Relationship model Sample Clauses

Entity-Relationship model. Table 2 reports the attributes and the named associations for the classes in the E-R schema in Figure 3. Figure 3 – E-R model: main, linked, static and structural entities Figure 4 - E-R model: Result entities Figure 5 – E-R model: provenance relationships Table 2 – E-R Schema: class properties Result • title • subtitle (optional) • dateOfCreation (optional) • description 🡺 creators (0 or N Person_Result) 🡺 result-1 (0 or N Result_Organization) 🡺 instances (0 or N Instance) 🡺 subjects (0 or N Subject) 🡺 collectedFrom (0 or 1 Data Source) 🡺 languageClass (1 Class) 🡺 languageScheme (1 Scheme) 🡺 licenseClass (1 Class) 🡺 licenseScheme (1 Scheme) Person • persistentIdentifier • firstName • secondNames • fax • email • phone • creations (0 or N Person_Result) • contactPerson-1 (0 or N Project_Organization) • nationalityClasses (0 or 1 Class) • nationalityScheme (0 or 1 Scheme) 🡺 collectedFrom (0 or 1 DataSource) Constraints: • This.nationalityClass must be associated to This.nationalityScheme Dataset (isA Result) • device (optional) 🡺 dataset1-1 (0 or N Dataset_Dataset) 🡺 dataset2-1 (0 or N Dataset_Dataset) 🡺 dataset-1 (0 or N Publication_Dataset)🡺 typeClass (1 Class) 🡺 typeScheme (1 Scheme) Constraints: • This.typeClass must be associated to This.typeScheme Publication (isA Result) • publisher (optional) • embargoEndDate (optional) 🡺 publication1-1 (0 or N Publication_Publication) 🡺 publication2-1 (0 or N Publication_Publication) 🡺 publication-1 (0 or N Publication_Dataset)🡺 typeClass (1 Class) 🡺 typeScheme (1 Scheme) Constraints: • This.typeClass must be associated to This.typeScheme • This.licenseClass must be associated to This.licenseScheme Project • persistentIdentifier • webSiteURL (optional) • acronym • title • start_date • end_date • call_identifier (optional) • keywords (optional) • duration (derived: from start_date and end_date) • EC_SC39 (optional) • organizations (1 or N Project_Organization) 🡺 funds (0 or N Project_Funding) 🡺 collectedFrom (0 or 1 DataSource) Notes For EC projects OriginalIdentifier contains the grant agreement number. Organization • persistentIdentifier • legal short name • legal name • webSiteURL • logoURL (optional) • EC_LegalBody (boolean) (optional) • EC_LegalPerson (boolean) (optional) • EC_NonProfit (boolean) (optional) • EC_ResearchOrganization (boolean) (optional) • EC_HigherEducation (boolean) (optional) • EC_InternationalOrganization EurInterests (boolean) (optional) • EC_Enterprise (boolean) (optio...
Sample 1
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Entity-Relationship model. Entity-Relationship (ER) Model is based on the notion of real-world entities and relationships among them [GAR97]. While formulating real-world scenario into the database model, the ER Model creates entity set, relationship set, general attributes and constraints. ER Model is best used for the conceptual design of a database. ER Model is based on Entities, and their attributes, and Relationships among entities. • Entity − An entity in an ER Model is a real-world entity having properties called attributes. Every attribute is defined by its set of values called domain. • Relationship − The logical association among entities is called relationship. Relationships are mapped with entities in various ways. Mapping cardinalities, which define the number of association between two entities, are one to one, one to many, many to one and many to many. The most popular data model in DBMS is the Relational Model. It is more scientific a model than others. This model is based on first-order predicate logic and defines a table as an n- ary relation. The main highlights of this model are: • Data is stored in tables called relations. • Relations can be normalized. • In normalized relations, values saved are atomic values. • Each row in a relation contains a unique value. • Each column in a relation contains values from a same domain. A database schema is the skeleton structure that represents the logical view of the entire database. It defines how the data is organized and how the relations among them are associated. It formulates all the constraints that are to be applied on the data. Database schema defines its entities and the relationship among them. It contains a descriptive detail of the database, which can be depicted by means of schema diagrams. It’s the database designers who design the schema to help programmers understand the database and make it useful. A database schema can be divided broadly into two categories: • Physical Database Schema − This schema pertains to the actual storage of data and its form of storage like files, indices, etc. It defines how the data will be stored in a secondary storage. • Logical Database Schema − This schema defines all the logical constraints that need to be applied on the data stored. It defines tables, views, and integrity constraints. A database instance is a state of operational database with data at any given time. It contains a snapshot of the database. Database instances tend to change with time. A DBMS ensures that it...
Sample 1

Related to Entity-Relationship model

  • No Agency Relationship Nothing herein contained shall be deemed to authorize or empower either party to act as agent for the other party to this Agreement, or to conduct business in the name, or for the account, of the other party to this Agreement.

  • INDEPENDENT RELATIONSHIP This Agreement is not intended to constitute, create, give effect to or otherwise recognize a joint venture, partnership, or formal business organization, or agency agreement of any kind, and the rights and obligations of the Parties shall be only those expressly set forth herein.

  • Parties’ Relationship The parties to the Agreement are independent parties. BNY Mellon, in furnishing the Services, is acting as an independent contractor. BNY Mellon has the sole right and obligation to supervise, manage, contract, direct, procure, perform or cause to be performed, all work to be performed by BNY Mellon and its employees, agents, independent contractors and other representatives under the Agreement. At no time shall any such individuals represent himself or herself as an employee of a Fund or be considered an employee of a Fund. BNY Mellon is not a joint venturer with, nor an employee, agent or partner of the Funds and has no authority to represent or bind the Funds as to any matters.

  • No Fiduciary Relationship This Agreement does not create, and shall not be construed as creating rights enforceable by any person or entity not a party hereto, except those entitled hereto by virtue of the indemnification provisions hereof. The Company acknowledges and agrees that the Placement Agent is not and shall not be construed as a fiduciary of the Company and shall have no duties or liabilities to the equity holders or the creditors of the Company or any other person by virtue of this Agreement or the retention of the Placement Agent hereunder, all of which are hereby expressly waived.

  • Independent Contractor Relationship SELLER is an independent contractor in all its operations and activities hereunder. The employees used by SELLER to perform Work under this Contract shall be SELLER's employees exclusively without any relation whatsoever to LOCKHEED XXXXXX.

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