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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)
SQL: Intro
Data Manipulation Language (DML)
Other Commands
indexes, constraints, views, triggers, transactions, authorization, …
Jennifer Widom
SQL: Intro
The Basic SELECT Statement
Select A1,A2,…,An
From
R1,R2, …,Rm
Where condition
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