#Pengertian program data independence full version#

Loan-number L-17 L-23 L-15 L-14 L-93 L-11 L-17 L-16Ĭustomer city Harrison Rye Harrison Rye Pittsfield Stanford Princeton Pittsfield Palo Alto Woodside Brooklyn Stanfordīranch name Downtown Redwood Perryridge Downtown Mianus Roundhill Perryridge

If no two dependent names (dname) are same then dname is the partial key.ĭBMS : 3 Branch-name Downtown Mianus Perryridge Roundhill Brighton Redwood BrightonĪccount number A-101 A-215 A-102 A-305 A-201 A-222 A-217Ĭustomer-name Johnson Smith Hayes Turner Johnson Jones Lindsayīranch-name Downtown Redwood Perryridge Mianus Roundhill Pownal North town Brightonīranch-city Brooklyn Palo Alto Horseneck Horseneck Horseneck Bennington Rye BrooklynĪssets 9000000 2100000 1700000 400000 8000000 300000 3700000 7100000Ĭustomer-name Jones Smith Hayes Jackson Curry Smith Williams AdamsĬustomer name Jones Smith Hayes Curry Lindsay Turner Williams Adams Johnson Glenn Brooks GreenĬustomer street Main North Main North Park Putnam Nassan Spring Alma Sand hill Senator WalnutĪccount-number A-101 A-215 A-102 A-305 A-201 A-217 A-222 Partial Key- Set of attributes that can uniquely identify weak entities related to the same owner entity. Primary Key- That super key selected by a DataBase Administrator (DBA) for implementation. minimal super key is called a candidate key. Super Key- It is a collection of one or more attributes which allows users to identify a tuple uniquely.Ĭandidate Key-If all proper subsets of a super key is not a super key then that super key is called a candidate key i.e.

#Pengertian program data independence full version#

View- It is the permission through which a user will be allowed to see the portion of the database but not the full version to enhance the security measures. Multivalued attribute- It has a set of values of a specific entity e.g. Normalization- It is a process to remove anomalies, redundancy and inconsistency of a database. Schema- The logical description and the overall design of a database is called schema.ĮR diagram- The pictorial representation of the database. Instance- The collection of information stored in the database at a particular moment is called an instance of the database. Tuple / record- Each row wise entry in a database is called tuple/record.Īttribute/field- Each tuple is consisting of set of attributes.ĭomain- It specifies the set of values that may be assigned to that attribute for each individual entity. Key Foreign Primary Super Candidate Partial Secondary Alternate ER Diagram key View Database Language DDL DML Procedural (what,how) Nonprocedural (what) Multivalued Attribute Derived Attribute Entity Set Relationship Set Links DDBMS CS Database (Client Server) Alternate Key Terminologies DBMS Tuple/Record Attribute/Field Domain Instance Schema Normalization(1 nf to 5 nf) and BCNF,DKNF/PJNF Anomaly Insertion Deletion Updation Relationship Mother Son Daughter Sister Brother Daughter Library (R#, Name, Age, B#, Bname, Subject, Price) Student Book R# 1 2 3Įmpname Abir Abir Abir Soumen Soumen Soumenĭname Tripti Sankha Briti Jayita Aritra Aritra The primary goal of DBMS is to provide an environment that is both convenient and efficient to use in retrieving and storing database information.īname Algebra Co-ordinate Optics Sound Organic The set of data normally referred to as the database, contains information about one particular enterprise.

Introduction to DBMS A DBMS consists of a collection of interrelated data and a set of programs to access those data.