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Introduction to SQL

Introduction toSQLPhil SpectorIntroduction to SQLPhil SpectorStatistical Computing FacilityUniversity of California, BerkeleyIntroduction toSQLI ntroduction toSQLWhat is SQL?IStructured Query LanguageIUsually talk to a database serverIUsed as front end to many databases (mysql,postgresql, oracle, sybase)IThree Subsystems: data description, data access andprivilegesIOptimized for certain data arrangementsIThe language is case-sensitive, but I use upper casefor toSQLWhat is SQL?IStructured Query LanguageIUsually talk to a database serverIUsed as front end to many databases (mysql,postgresql, oracle, sybase)IThree Subsystems: data description, data access andprivilegesIOptimized for certain data arrangementsIThe language is case-sensitive, but I use upper casefor toSQLWhat is SQL?IStructured Query LanguageIUsually talk to a database serverIUsed as front end to many databases (mysql,postgresql, oracle, sybase)IThree Subsystems: data description, data access andprivilegesIOptimized for certain data arrangementsIThe language is case-sensitive, but I use upper casefor toSQLWhat is SQL?

SQL Some Relational Database Concepts I A database server can contain many databases I Databases are collections of tables I Tables are two-dimensional with rows (observations) and columns (variables) I Limited mathematical and summary operations available I Very good at combining information from several tables

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