'Seattle view' presentation slideshows

Lecture 06: SQL

Lecture 06: SQL. Friday, January 14, 2005. Outline. Indexes Defining Views (6.7) Constraints (Chapter 7) We begin E/R diagrams (Chapter 2). Indexes. REALLY important to speed up query processing time. Suppose we have a relation Person (name, age, city)

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Lecture 5: SQL Schema & Views

Lecture 5: SQL Schema & Views. Data Definition in SQL. So far we have see the Data Manipulation Language , DML Next: Data Definition Language (DDL) Data types: Defines the types. Data definition: defining the schema. Create tables Delete tables

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Data Definition in SQL

Data Definition in SQL. So far we have see the Data Manipulation Language , DML Next: Data Definition Language (DDL) Data types: Defines the types. Data definition: defining the schema. Create tables Delete tables Modify table schema

303 views • 26 slides

Correlated Queries

Correlated Queries. A nested query that requires the subquery to be evaluated many times; once for each value in the outer query. Example: Find movies whose title appears more than once. SELECT title FROM Movie AS Old WHERE year < ANY ( SELECT year

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Aggregation

190 views • 18 slides