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What are the Constituents of File? Also elaborates all the possible file operations?
A file is organised logically as sequence of record. These records are mapped onto disk blocks. Although blocks are of fixed size denoted through the physical properties of the disk and through the operating system, record sizes vary. In a relational database, tuples of distinct relations are commonly of different sizes.
Possible operations on a file: (i) Create: a file can be created (ii) Delete: a file can be deleted (iii) Changing attributes of a file: The attributes of a file say read only, author's name etc. can be changed. (iv) Contents of the file can be altered.
What is trigger? Triggers are statements that are executed automatically by the system as the side effect of a modification to the database.
Object-based Models: Use objects as key data representation components . Examples:- Entity-Relationship Model: It is a collection of real world objects known as entitie
Project Description: I am having a random problem with my Wordpress site. If I click on "Publish" and "Add new", it takes me to a 404 page not found of /wp-admin/post.php (th
Problem: (a) Given the following relation: Stats(Name,Sex,Children, Occupation, Salary, Tax, Audits) Write SQL code to define the following security constraints: (i) User
A super key is an attribute or set of attributes used to recognize the records uniquely in a relation. For instance, in the Relation PERSON defines earlier PERSON_ID is a super
East Coast Aquarium Relational Database
10A.53 Code an Oracle Database trigger to enforce the constraint that an employee can never change his or her department. 10A.54 Code an Oracle Database trigger to allow the
Explain the Concept of Two-phase Locking It concerns the positions of locking and unlocking operations in each transaction. In this protocol every transaction issue lock and u
#floating point representation is used to store
Explain Candidate key? Candidate Key - A candidate key is a minimal superkey, that can be used to uniquely identify a tuple in the relation.
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