SQL: Queries, Constraints, Triggers SQL Aggregates Practice Queries CS430/630 Lecture 9 Slides based on “Database Management Systems” 3rd ed, Ramakrishnan and Gehrke Example 1 “Find the average age of students taking some course with 3 credits” Simple solution, but if same student takes multiple 3-credit courses, it may not be what we expect SELECT AVG […]
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Microsoft® SQL Server ® 2012 T-SQL Fundamentals Itzik Ben-Gan Published with the authorization of Microsoft Corporation by: O’Reilly Media, Inc. 1005 Gravenstein Highway North Sebastopol, California 95472 Copyright © 2012 by Itzik Ben-Gan All rights reserved. No part of the contents of this book may be reproduced or transmitted in any form or by any
Logout CSC 105: 201801 A01 & A02: CSC 105: 201801 A01 & A02: Tests & Quizzes Quiz 3 CSC105, 2018 Part 1 of 2 – Access Databases Questions about ER diagrams and Access tables Question 1 of 4 The following Entity Relationship Diagram shows Directors, Movies, Roles, Actors, Achievements for both actors and movies. You
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module6 Database Management, GMU, Prof. Alex Brodsky, Module 6 1 Basic SQL Module 6 Prof. Alex Brodsky Database Systems Database Management, GMU, Prof. Alex Brodsky, Module 6 2 Example Instances R1 S1 S2 ❖ We will use these instances of the Sailors and Reserves relations in our examples. ❖ If the key for the Reserves
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SQL: Queries, Constraints, Triggers Null Values. SQL Constraints CS430/630 Lecture 10 Slides based on “Database Management Systems” 3rd ed, Ramakrishnan and Gehrke Null Values Field values in a tuple may sometimes be unknown: e.g., a rating has not been assigned, or a new column is added to the table inapplicable: e.g., CEO
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COMP284 Scripting Languages – Handouts (8 on 1) COMP284 Scripting Languages Lecture 13: PHP (Part 5) Handouts (8 on 1) Ullrich Hustadt Department of Computer Science School of Electrical Engineering, Electronics, and Computer Science University of Liverpool Contents 1 Classes Defining and Instantiating a Class Visibility Class Constants Static Properties and Methods Destructors Inheritance Interfaces
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SQL: Queries, Constraints, Triggers SQL Aggregate Queries CS430/630 Lecture 8 Slides based on “Database Management Systems” 3rd ed, Ramakrishnan and Gehrke Aggregate Operators Significant extension of relational algebra COUNT (*) COUNT ( [DISTINCT] A) SUM ( [DISTINCT] A) AVG ( [DISTINCT] A) MAX (A) MIN (A) SELECT COUNT (*) FROM Sailors S A is a
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7class-a Data Mining: Concepts and Techniques 1 COMP9318: Data Warehousing and Data Mining — L7: Classification and Prediction — n Problem definition and preliminaries Data Mining: Concepts and Techniques 2 Data Mining: Concepts and Techniques 3 n Classification: n predicts categorical class labels (discrete or nominal) n classifies data (constructs a model) based on the
IT enabled Business Intelligence, CRM, Database Applications Sep-18 Structured Query Language Prof. Vibhanshu (Vibs) Abhishek The Paul Merage School of Business University of California, Irvine 273 Session 2 1 Agenda Structured Query Language Multi-table queries Reminders Buy iClicker and register at iClicker.com 2 SQL Example Product Maker Model Type Printer PrinterModel Color Type Price PC
Programming Language Pragmatics Programming Language Pragmatics FOURTH EDITION This page intentionally left blank Programming Language Pragmatics FOURTH EDITION Michael L. Scott Department of Computer Science University of Rochester AMSTERDAM • BOSTON • HEIDELBERG • LONDON NEW YORK • OXFORD • PARIS • SAN DIEGO SAN FRANCISCO • SINGAPORE • SYDNEY • TOKYO Morgan Kaufmann is