that is created within an application session and discarded at the end of the session is called persistent data. (2) True or False? A file is the common denominator of storage. (3) True or False? A business rule may be represented in an ER diagram using mandatory/optional symbols. (4) True or False? Duplicate tuples are allowed in a relation. (5) True or False? If there is only one candidate key for a relation‚ then the candidate key automatically becomes the primary key.
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< Project scenario name > Software Requirements Specification 2.9 Version X.0 Class Diagram ........................................................................ Sequence Diagram s ............................................................... 2.10 Database Design .................................................................... 2.11.1 2.11.2 2.12 3.0 ER Diagram ............................................................... Schema ..........................
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Advantages of a Relational database Relational databases are the standard when creating industrial standard efficient and scalable databases. They are based on a structure of tables which are logically connected to each other and can be queried in complex way to extract relevant and meaningful information. The querying of a relational database is done using a high level language called SQL which stands for structured query language. SQL is very easy to understand and unlike
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sections. The first introduces the REA approach and comments on the general problems associated with traditional accounting practice that can be resolved through an REA approach. This section presents the REA model and describes the structure of an REA diagram. The basic REA model consists of three entity types (resources‚ events‚ and agents) and a set of associations linking them. Resources are things of economic value to the organization and are the objects of economic exchanges with trading partners
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System objectives 1.3 Project scope . 1.4 Project approach 1.5 Context Diagram Notation about DFD. 2.1Data flow diagrams. 2.2Decomposed DFDs. 2.2.1 Process Create bills [3]. 2.2.2 Process Create reports and queries [4] 2.2.3 Process Maintain Books Information [1] 2.2.4 Process Make book search [2] 3.1 State transaction diagram STD 3.2 Screen hierarchy. Appendix:
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In order for the prolactin single peptide to enter the ER lumen and be cleaved by signal peptidase‚ the prolactin nascent chain must be 130 codons. The mRNA at size 130 codons in length is seen to have cleavage in the presence of microsomes. The shorter sized mRNA’s in the presence of microsomes‚ are the non cleaved residue peptides in which the signal peptidase is unable to cleave the signal sequence amino acid. B. Band B is the cleavage of the signal sequence by the signal peptidase. The cleavage
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w w ap eP m e tr .X w UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS s er om .c GCE Ordinary Level MARK SCHEME for the October/November 2008 question paper 5054 PHYSICS 5054/02 Paper 2 (Theory)‚ maximum raw mark 75 This mark scheme is published as an aid to teachers and candidates‚ to indicate the requirements of the examination. It shows the basis on which Examiners were instructed to award marks. It does not indicate the details of the discussions
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Information Systems (IJCIS)‚ Vol. 7‚ 1998 [17] Golfarelli M‚ Rizzi S.‚ A Methodological Framework for Data Warehouse Design‚ Proceeding of the ACM DOLAP98 Workshop‚ 1998 [18] Lujan-Mora S.‚ Trujillo J.‚ Song I.‚ Multidimensional Modeling with UML Package Diagrams‚ 21st International Conference on Conceptual Modeling (ER2002)‚ 2002 [19] Trujillo J.‚ Palomar M.‚ An Object Oriented Approach to Multidimensional Database Conceptual Modeling (OOMD) ‚ Proceeding 1st International Workshop on Data Warehousing and
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by the system. Entities represent all the information sources of the system. We represent the entities and the processes in the data flow diagrams‚ DFD. While designing the DFD’s we increase the level of detail with each level. At each level the process divides into sub-processes until indivisible sub-processes are reached. Here is an example. Data Flow Diagram 0: Here we represent the information system at Riordon Manufacturing Inc. The information system comprises of : – Employees
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Page 1 of 8 BIOLOGY 12- CELL STRUCTURE & FUNCTION Chapter Notes THE CELL THEORY • Although different living things may be as unlike as a violet and an octopus‚ they are all built in essentially the same way. The most basic similarity is that all living things are composed of one or more cells. This is known as the Cell Theory. • our knowledge of cells is built on work done with microscopes • English scientist Robert Hooke in 1665 first described cells from his observations of cork slices
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