RDBMS COMPLETE REFERENCE PDF
The Complete Reference, . A Conceptual Guide as well as this book. Aaron Davenport has been working with SQL-based RDBMS technologies for over ten. The Complete Reference,. Second Edition. James R. Groff and Paul N. Weinberg . Complete Database Language. How the DBMS Handles Views. Relational Database Design: Domain and Data dependency, Armstrong's .. Since the number of redundant disks is proportional to the log of the total . contains an index that references one or more key fields of each data record to its .
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spatial data to a relational database management RDBMS allowing for high- performance access to all .. Peer review applications and complete layers. database language, ISBL, that has been my guide ever since. . This book is accompanied by Exercises in Relational Database Theory, A complete grammar for Tutorial D does not yet exist and the incomplete one that does exist does not. RDBMS stands for Relational Database Management System. RDBMS data is . where, i - the precision, is the total number of decimal digits and j - the . Foreign key of course table is (Department_id) which references the department table.
A collection of conceptual tools for describing data, data relationships data semantics and constraints. What is E-R model? This data model is based on real world that consists of basic objects called entities and of relationship among these objects.
Entities are described in a database by a set of attributes. What is Object Oriented model? This model is based on collection of objects.
An object contains values stored in instance variables with in the object. An object also contains bodies of code that operate on the object.
These bodies of code are called methods. Objects that contain same types of values and the same methods are grouped together into classes. What is an Entity? It is a 'thing' in the real world with an independent existence. What is an Entity type? It is a collection set of entities that have same attributes.
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What is an Entity set? It is a collection of all entities of particular entity type in the database. What is an Extension of entity type? The collections of entities of a particular entity type are grouped together into an entity set.
What is Weak Entity set?
An entity set may not have sufficient attributes to form a primary key, and its primary key compromises of its partial key and primary key of its parent entity, then it is said to be Weak Entity set. What is an attribute? It is a particular property, which describes the entity. What is a Relation Schema and a Relation? A relation Schema denoted by R A1, A2, A relation is defined as a set of tuples. Let r be the relation which contains set tuples t1, t2, t3, What is degree of a Relation?
It is the number of attribute of its relation schema. What is Relationship? It is an association among two or more entities. What is Relationship set? The collection or set of similar relationships.
What Can SQL do?
What is Relationship type? Relationship type defines a set of associations or a relationship set among a given set of entity types. What is degree of Relationship type? It is the number of entity type participating. A data base schema is specifies by a set of definitions expressed by a special language called DDL. It specifies user views and their mappings to the conceptual schema. This language is to specify the internal schema. This language may specify the mapping between two schemas.
What is Data Storage - Definition Language? The storage structures and access methods used by database system are specified by a set of definition in a special type of DDL called data storage-definition language. This language that enable user to access or manipulate data as organised by appropriate data model.
What is DML Compiler? It translates DML statements in a query language into low-level instruction that the query evaluation engine can understand. What is Query evaluation engine? It executes low-level instruction generated by compiler. What is DDL Interpreter?
It interprets DDL statements and record them in tables containing metadata. What is Record-at-a-time? This retrieve of a record is said to be Record-at-a-time. What is Set-at-a-time or Set-oriented? This retrieve of a record is said to be Set-at-a-time or Set-oriented.
What is Relational Algebra? It is procedural query language. It consists of a set of operations that take one or two relations as input and produce a new relation. What is Relational Calculus? It is an applied predicate calculus specifically tailored for relational databases proposed by E. How does Tuple-oriented relational calculus differ from domain-oriented relational calculus? The tuple-oriented calculus uses a tuple variables i. QUEL 2.
The domain-oriented calculus has domain variables i. What is normalization? It is a process of analysing the given relation schemas based on their Functional Dependencies FDs and primary key to achieve the properties 1. Minimizing redundancy, 2. Minimizing insertion, deletion and update anomalies. What is Functional Dependency? A Functional dependency is denoted by X Y between two sets of attributes X and Y that are subsets of R specifies a constraint on the possible tuple that can form a relation state r of R.
This means the value of X component of a tuple uniquely determines the value of component Y.
What is Lossless join property? It guarantees that the spurious tuple generation does not occur with respect to relation schemas after decomposition. What is 1 NF Normal Form? The domain of attribute must include only atomic simple, indivisible values.
What is Fully Functional dependency?
RDBMS-Infosys.pdf - Relational Database Management System...
It is based on concept of full functional dependency. A functional dependency X Y is full functional dependency if removal of any attribute A from X means that the dependency does not hold any more. What is 2NF? What is 3NF? X is a Super-key of R. A is a prime attribute of R. In other words, if every non prime attribute is non-transitively dependent on primary key.
What is 4NF? X is a super key.
What is 5NF? The join dependency is implied by the set of FD, over R in which the left side is key of R. What is Domain-Key Normal Form? A relation is said to be in DKNF if all constraints and dependencies that should hold on the the constraint can be enforced by simply enforcing the domain constraint and key constraint on the relation. That is, a structured type can have subtypes that reuse all of its attributes and contain additional attributes specific to the subtype.
Another advantage, the object behavior, is related with access to the program objects. Such program objects must be storable and transportable for database processing, therefore they usually are named as persistent objects. Inside a database, all the relations with a persistent program object are relations with its object identifier OID. The methods denoted by one name are distinguished by the type of their parameters and type of objects for which they attached method signature.
The OOP languages call this the polymorphism principle, which briefly is defined as "one interface, many implementations". Other OOP principles, inheritance and encapsulation , are related both to methods and attributes.
It is a 'thing' in the real world with an independent existence. Undo phase. See more details and download here:
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