Relational Databases Lee Rudd Abstract Data for our programs are stored in various formats. The most commonly used format is in the form of a database since databases are not dependent on a single program or hardware platform. These databases are stored in five structures of hierarchical‚ network‚ relational‚ multidimensional‚ and object-oriented. Hierarchical structure organizes data in a one to many relationship. The network goes of the hierarchical structure by organizing data in
Premium Database Relational model SQL
1. Advantages of database over Advantages of spread sheets; One of the advantages of database is that it reduced data redundancy this is because in databases‚ there is an identifier. The identifier is the primary key‚ where when it is entered‚ all other details‚ which saved under the primary key‚ will be revealed. Therefore‚ there’ll be less repetition of data. Next‚ databases improved data integrity‚ which it will guaranteed the data proven to be correct. Linked to the primary key function‚ the
Premium Database Relational model Spreadsheet
Experimental Report: Oxidation and Reduction Factors Affecting Electrochemical Cells Research Question: How do the changeable electrodes of different reactivity affect the energy in Volts measured by a Voltmeter while the Solution and the Salt Bridge stay constant for every single trial by the same amount in each beaker? Background Theory: The conductance of an electrolyte depends upon the number of ions present in the solution. Therefore‚ the greater the number of ions in the solution
Premium Electrochemistry Electrolyte
DATABASE SPECIFICATIONS 1. TABLE NAME : TBLGENDER FIELD NAME DATA TYPE SIZE CONSTRAINT REFERENCES GID IntN/A PK‚ IDENTITY NONE GDESC Varchar6 NOT NULL NONE 2. TABLE NAME: TBLGRDLVL FIELD NAME DATA TYPE SIZE CONSTRAINT REFERENCES GRDID IntN/A PRIMARY KEY‚IDENTITY NONE GRDLVLDESC VarChar15 NOT NULL NONE GRDSECTION Varchar15 NOT NULL NONE 3. TABLE NAME: TBLRANK FIELD NAME DATA TYPE SIZE CONSTRAINT REFERENCES RANKID IntN/A PRIMARY KEY‚IDENTITY NONE RANKDESC Varchar20 NOT NULL NONE 4.
Premium SQL Data modeling
Table: Similar to spreadsheet used to store data. 2. Queries: Method of extracting specific data 3. Forms: Element to modify and insert records into you databases 4. Reports: It contains raw data and allows the organization of information in an easy way. 5. Databases: collection of associated information 6. Relational databases: access databases in which more than one can share information. 7. Record: each row in a table. 8. Data Value: an item such as data‚ or such as a single phone number.
Premium Relational database Relational model Database
The entity-relationship model (or ER model) is a way of graphically representing the logical relationships of entities (or objects) in order to create a database. entity type is a collection of entity instances sharing similar properties Strong Entity Vs Weak Entity An entity set that does not have sufficient attributes to form a primary key is termed as a weak entity set. An entity set that has a primary key is termed as strong entity set. A weak entity is existence dependent. That is the
Premium Entity-relationship model Data modeling
The Alumni Management System provides following features. * Members Directory * Online photo gallery * Comment posting facility C. STATEMENT OF PROBLEM The aim of the software is to develop a software that helps the university to keep good record of their old students‚ in order to refer to them when necessary‚ even on occasions where they want to make a year book for the graduating class or something. D. PROJECT OBJECTIVES OBJECTIVE: The central objective of this project is to provide
Premium PHP Web server
CHURCH MEMBERSHIP DATABASE PROJECT Arusha‚ Tanzania BASIC DATA SUMMARY Name of company: Tanzania Union Mission Contact name and post: Tanzania Union Mission P.O. Box 1121 Arusha‚ Tanzania. Location: The Organization is located in Arusha‚ Tanzania.It is situated at Njiro road‚ Plot no 139‚ House no.51‚ Njiro Hill‚ Arusha Municipality. Project Summary: The Project is on Database system mainly focused on introducing an Up-to-date
Premium Project management Database management system Database
Oracle Table Triggers Version 11.1 General Data Dictionary Views Related To DDL Triggers trigger$ dba_triggers all_triggers user_triggers System Privileges Related To Table Triggers create trigger create any trigger administer database trigger alter any trigger drop any trigger Table Trigger Firing Options -- before constraints are applied BEFORE INSERT BEFORE UPDATE BEFORE DELETE -- after constraints are applied AFTER INSERT AFTER UPDATE AFTER DELETE Transaction
Premium SQL
Benefits of a Database and Information-Gathering Techniques Brian Morrow Professor Cohen CIS 111 May 5‚ 2013 A database management system is a system in which data is stored‚ processed‚ and retrieved. These systems are known for security accuracy and consistency. A well-planned and developed database is very efficient and meets the current and future needs of the organization to which it services. This type of system allows the organization to collectively store and manipulate data. One key
Premium Database SQL Databases