• Database
    attributes. (d) Identify relationship cardinalities. •Mapping constraint (1:1, 1:N, N:M) •Participation constraint (Total, Partial) (e) Assign attributes to entity types and relationship types. Usually attributes come from nouns, adjectives or adverbs. (f) Select identifiers (primary keys) for entity...
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  • Projecct
    analyst would ask “What must we know about each object in order to run a business?” in order to determine relationships, | | |their cardinality, and degrees...
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  • Use of Computers
    . What do you mean by key ? 52. Write types of keys ? 53. What do you mean by integrity constraints ? 54. What do you mean by procedural DML ? 55. What is query processing ? 56. What is the function of parser in query processing ? 57. What is file organisation ? 58. What are direct...
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  • System Analysis and Design
    four SUPPLIERS. The fact that a supplier only sometimes supplies items implies that the business wants to keep track of some suppliers without designating what they can supply. This diagram includes two names on each line, giving you explicit language to read a relationship in each direction. For...
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  • Optimisation Genetic Algorithms
    of around 600 stocks currently listed on the JSE). This type of cardinality constraint is not easily applied to the Markowitz model as it results in a mixed integer nonlinear programming problem, and classical algorithms are typically unable to optimise this problem. The issue of transaction...
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  • Explain Plan
    object name columns. TYPICAL Includes the information shown in BASIC plus additional optimizer-related internal information such as cost, cardinality estimates, etc. This information is shown for every operation in the plan and represents what the optimizer thinks is the operation cost, the number of...
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  • Er Modleing
    database design? The next four questions are based on the ERD in Figure Q4.17. FIGURE The ERD for Questions 17–20 Q4.17 17. Write the 10 cardinalities that are appropriate for this ERD. 18. Write the business rules reflected in this ERD. 19. What two attributes must be contained in the...
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  • Modeling the Requirements Engineering Process
    ] ; another one relies upon domain classification and characterisation [12]. Similarly the completion of the current product may be performed by adding attributes to entity types or relationship types or defining cardinalities on roles. Alternatives of a macro-context are not necessarily exclusive and...
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  • NPS Journal Paper
    -recipe, or fixed-proportion) constraint. The formulette might be better expressed: (1/ 7) X1 = (1/ 9) X2 . Here too, we suggest trying a numerical example for X1 and see what that implies for X2. L4) “Sorties of type X1 must constitute at most 33% of all sorties of type X1, X2, and X3...
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  • programming basics
    diagram. (b) Is there a weak entity type? If so, give its name, its partial key, and its identifying relationship. (c) What constraints do the partial key and the identifying relationship of the weak entity type specify in this diagram? (d) List the names of all relationship types, and...
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  • Document Management
    types of data. The internal view is the view about the actual physical storage of data. It tells us what data is stored in the database and how. At least the following aspects are considered at this level: * Storage allocation e.g. B-trees, hashing etc. * Access paths e.g. specification...
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  • Database
    type of situation it is necessary to mention the role of the entities involved in the relationship. 96 © Copyright Virtual University of Pakistan Database Management System (CS403) VU Dependencies Dependency is a type of constraint, for example once we define the cardinality or...
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  • bussines
    the limit condition. Lets’ suppose we have a box, so we gonna use how many characters it fits, what data type, numeric/alphanumeric, special characters, back space, enter. CR/LF, Nulls, Negative, positive. For eg. Weather it accepts: 25 Characters [25 capital W letter, cause W is the most wide...
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  • It Sql Final
    types of cardinality which an entity could have in a relationship, the "Crow’s Foot" uses the following symbols: ring and dash represents zero or one; dash and dash represents exactly one; ring and crow’s feet represents zero or more; dash and crow’s feet represents one of more. What is a Candidate...
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  • IST223-GHW7FS13
    .) Relationship Cardinality Parent Child Type Max Min Order Order_Item ID-dependent 1:N M:O Customer Order Strong 1:N M:O Service Order_Item Strong 1:N M:O 1. A customer must exist to have one order 2. Customer doesn’t need to have an order 3. Order_Item needs a order...
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  • Inventory system
    duration of his stay in the respective department should be registered. Structural Constraints on Relationship 1. Constraints on Relationship / Multiplicity/ Cardinality Constraints 􀂾Multiplicity constraint is the number or range of possible occurrence of an entity type/relation that may...
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  • Gfgddgfdgfdggdgd
    how the specification is to be viewed. define problems and constraints - what is the situation currently? How does the company deal with the task which the new database is to perform. Any issues around the current method? What are the limits of the new system? define objectives - what is the new...
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  • Constrained Portfolio Optimization with Multi&Objective
    research. In this paper, I consider all relavant real world constraints– group and group bounds constraint besides cardinality constraints and asset bounds constraint. Multi-objective genetic algorithm is employed to solve this type of portfolio optimization problem. The results show the di¤erent...
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  • DATABASE CONSTRUCTION AND MGT
    the table, but the combination of the values for the primary key columns must be unique among all rows in the table. Some relational databases allow constraints to be specified at both the field level or for an entire table as a whole, depending on the type of constraint. 7.2. Referential...
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  • Is Competition Is Good or Bad
    a result of its functioning – to achieve the purpose. Output from individual subsystems may be inputs to other subsystems. 9. Constraints – there are limits to what the system can do (capacity, speed, capability); some imposed within the system itself, some by the environment (e.g. available...
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