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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.
What is the use of group by clause? Group by clause is used to be relevant aggregate functions to a set of tuples. The attributes given in the group by clause are used to shape
Smart Alex Catering Sevice (SACS) is a company offering top class catering staff for prestigious events. The company employs approximately 200 hourly paid contact staff - chefs,
Show, with the help of an example, that relatively high-level transitions result when system or program is stimulated by the outside events. In diagram below, we can observe i
Explain concurrency control? Concurrency control Oracles multiversion concurrency control varies from the concurrency mechanism used by some other data base vendors. Read
What are the four main characteristics of the database approach? The four major characteristics of the database approach are: 1. Self-describing nature of a database system. 2.
Domain Constraints Domain constraints are primarily formed for defining the logically correct values for an attribute of a relation. The relation allows attributes of a relatio
What are the properties of transaction? There are three properties of transactions :- A) Atomicity B) Consistency C) Isolation
Determine the steps of path in association network You can analyse use of paths in association network in the following steps: Examine every operation and see what asso
How to create values of structured type? Constructor functions are used to make values of structured types. A function with the similar name as a structured type is a construct
Convert the following ER - diagram (Entity Relationship Diagram) into a relational database (the primary keys are underlined): Ans: The relational database schema f
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