Jennifer Widom SQL Introduction. Jennifer Widom SQL: Intro  “S.Q.L.” or “sequel”  Supported by all major commercial database systems  Standardized.

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Presentation transcript:

Jennifer Widom SQL Introduction

Jennifer Widom 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

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

Jennifer Widom The Basic SELECT Statement Select A 1,A 2,…,A n From R 1,R 2, …,R m Where condition SQL: Intro

Jennifer Widom 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