پاورپوینت کامل Database & SQL introduction 48 اسلاید در PowerPoint

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پاورپوینت کامل Database & SQL introduction 48 اسلاید در PowerPoint

اسلاید ۴: Web programming course, Winter 2005DEFINITIONA collection of application programs that perform services to end users. Each program defines and manages its own data.File Based Systems

اسلاید ۵: Web programming course, Winter 2005Data Entry& ReportsFile handlingRoutinesFile DefinitionSales FilesData Entry& ReportsFile handlingRoutinesFile DefinitionLease FilesFile Based Processingphysical structure and storage of the data files are defined in the program code

اسلاید ۶: Web programming course, Winter 2005Data DependenceDuplication of DataIncompatible file formatsLimitations of File Based SystemsHow can these problems be resolved

اسلاید ۷: Web programming course, Winter 2005A shared collection of logically related data designed to meet the information requirements of an organisationThe Database Approach

اسلاید ۸: Web programming course, Winter 2005Data Entry& reportsData Entry& reportsDBMSSalesLeasesApplicationProgramsApp. ProgramsDatabaseDatabase Processing

اسلاید ۹: Web programming course, Winter 2005DEFINITIONA software system that enables users to define, create and maintain the database and which provides controlled access to the databaseDatabase Management System (DBMS)

اسلاید ۱۰: Web programming course, Winter 2005Allows users to define the database (DDL)Allows users to insert, update, delete & retrieve data (DML)Provides controlled accessa security systeman integrity systema concurrency control systema recovery systemFacilities of a DBMSWhat does it mean to define a database

اسلاید ۱۱: Web programming course, Winter 2005HardwareSoftwareDataProceduresPeopleComponents of a DBMS

اسلاید ۱۲: Web programming course, Winter 2005Minimal data redundancyConsistency of dataIntegration of dataImproved integrityConsistent securityStandardsIncreased productivityAdvantages

اسلاید ۱۳: Web programming course, Winter 2005ComplexityAdditional Hardware CostsSizePerformanceExperts -Specialised PersonnelPotential organisational ConflictHigher impact of failure (centralized data source failure)Disadvantages

اسلاید ۱۴: Web programming course, Winter 2005Database Interfacesweb server & interface progrelational databaseweb browserdedicated applicationSQL command interfaceSQLSQLSQL

اسلاید ۱۵: Web programming course, Winter 2005Interaction and FeedbackTransaction: non-decomposable unit of data manipulationexample: purchasing an airline ticket on-linetypically small and fast for commercial applicationsmay be long and involved in engineering applicationsRollback: if any part of a transaction fails, all completed parts are “rolled back” or undoneexample: if you haven’t provided your credit card number, airline ticket purchase on-line transaction failsrollback ensures integrity of databaseautomatically done by DBMS

اسلاید ۱۶: Web programming course, Winter 2005Relational Database ModelDatabaseDatabase is a collection of tables (relations)Data are stored in tablesTablesEach table has a name Each table has a set of columns (fields) and rows of data (records)All operations process a table to produce a new table Each table has a fixed number of columns Each table has an arbitrary number of rowsBased on set theory SQL (Structured Query Language) DBMS independent languageWhy

اسلاید ۱۷: Web programming course, Winter 2005Weather Sample TableCityState High LowPhoenixArizona10590TusconArizona10192FlagstaffArizona8869San DiegoCalifornia7760Albuquerque New Mexico8060

اسلاید ۱۸: Web programming course, Winter 2005Database Columns (Fields)Columns Each column has a nameColumns are accessed by nameNo standard column ordering Does not make sense to say “the third column” like it does in a “paper” table or spreadsheetData in a column belongs to a particular domain Columns are the “attributes” of the datasetEach value in a column is from the same domain Each value in a column is of the same data type

اسلاید ۱۹: Web programming course, Winter 2005Database Rows (Records)Rows Each row entry is either a simple value or empty (null) Rows are sets of values for the columns (attribute values) Primary key: a set of columns that uniquely identifies each rowEach row must be unique given the primary key (no duplicates) Rows