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Explain the use of constraints in functional model with suitable example.
A constraint shows relationship between two objects at same time, or among various values of the same object at different times. A constraint can be expressed as a total function or as the partial function. For instance, a coordinate transformation may specify that scale factor for x-coordinate and the y-coordinate will be equal. This constraint completely defines one value in terms of the other values
1. Use the Invoice table structure shown below to answer the following questions: a) Draw the dependency diagram and identify the primary key and all dependencies, including al
Write short notes on relational constraints? Relational Constraints are: 1. NOT NULL 2. Unique 3. Primary key 4. Foreign key 5. Table check
A Structure of a dependency diagram
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This language that enable user manipulate to or access data as organized by appropriate data model. Low level or Procedural DML : DML needs a user to specify what data ar
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Project Description: Oracle Certified Professional with 20 years of practice, Oracle version 6.0.34, 7.3, 8.0, 8i, 9i, 10G, 11G, 12C. Crossplatform migration, Informix, MSSql
Define Atom of domain relational calculus An atom has the outline 1 , x 2 , ... , x n > -> r , in which r stands for a relation on n attributes and x 1 , x 2 , ... , x n ar
Benefits of using heuristics
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