SQL Introduction.

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Presentation transcript:

SQL Introduction

SQL: Intro “S.Q.L.” or “sequel” Supported by all major commercial database systems Standardized – many new features over time Interactive via GUI or prompt, or embedded in programs Declarative, based on relational algebra

SQL: Intro Data Definition Language (DDL) Data Manipulation Language (DML) Other Commands indexes, constraints, views, triggers, transactions, authorization, …

SQL: Intro The Basic SELECT Statement Select A1,A2,…,An From R1,R2, …,Rm Where condition

SQL: Intro “S.Q.L.” or “sequel” Supported by all major commercial database systems Standardized – many new features over time Interactive via GUI or prompt, or embedded in programs Declarative, based on relational algebra