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Describe the functions and features of foreign key?
Foreign Key : The primary key of one file or table that is implanted in another file or table to implement the relationships among them. Foreign keys are used to implement some kinds of relationships. Foreign keys do not exist in information models.
Law Associates is a large legal practice based in Sydney. You have been asked to design a data model for the practice based upon the following specification: The practice employs
What are the parts of SQL language? The SQL language has various parts: data - definitition language Data manipulation language View definition Transaction contr
explain participation constraints with examples
Explain the two constraints, check and foreign key in SQL along with an example for each. Give the syntax. CHECK constraint - CHECK constraint specifies an expression which
How does a query tree represent a relational algebra expression? Ans: This includes transforming an initial expression (tree) into an equivalent expression (tree) that is
Define- relational algebra. The relational algebra is a procedural query language. It having of a set of operations that take one or two relation as input and make a new relati
Question : Object-Oriented Database (OODM) is defined as a logical data model that captures the semantics of objects supported in object-oriented programming. An Object-Oriente
how to prepare a data dictionary for online examination system for certified courses?
statical data
State The position of object at any moment is called state. An object can have many states depend upon time. After receiving some input instructions, the object can change its
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