DATABASE FUNCTIONAL DEPENDENCY A functional dependency occurs when one attribute in a relation uniquely determines another attribute. This can be written A -> B which would be the same as stating "B is functionally dependent upon A." EXAMPLE In table listing employee characteristics including Social Security Number (SSN) and name‚ it can be said that name is functionally dependent upon SSN (or SSN -> name) because an employee’s name can be uniquely determined from their SSN. However‚ the
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Part 2: Vendor Database (MS Access) As you recall‚ data is a collection of facts (numbers‚ text‚ even audio and video files) that is processed into usable information. Much like a spreadsheet‚ a database is a collection of such facts that you can then slice and dice in various ways to extract information or make decisions. However‚ the advantage and primary use of a database over a spreadsheet is its ability to handle a large volume of data and yet allow for quick access to the information that
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Introduction This paper will compare and contrast five different database management systems on six criteria. The database management systems (DBMS) that will be discussed are SQL Server 2000‚ Access‚ MySQL‚ DB2‚ and Oracle. The criteria that will be compared are the systems ’ functionality‚ the requirements that must be met to run the DBMS‚ the expansion capabilities if it is able to expand to handle more data over time‚ the types of companies that typically use each one‚ the normal usage of
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(c) Natural join of r and u. Actually‚ you were asked to evaluate the expression r |x| s. The two relations (r and s) have join attribute B. The joined result is: A B 3 4 7 a b a 2. For the transaction database shown in a slide‚ how can we “flatten” it to make it a relational table (i.e.‚ in 1NF)? Show the resulting RDB table and identify its primary key. . Result (“flattened” table in 1NF‚ with primary key): TID Item 10 A 10 B 10 D 20 A 20 C 20 D 30 A 30 D
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Oracle Database 11g Performance Tuning PreSales 1. What type of data would benefit from the use of a reverse index? For index values which increment by 1. (*) For any character-based index value. For any index value with repeating sections. For indexes with low cardinality. Correct‚ a reverse index would work well for tables where the index values increment by 1. 2. When should you resort to using an hint in an SQL statement? You should always use hints. You should
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Table Queries SQL Server Database - Kudler Fine Foods Week 2 POS/410\ April‚ 09 2012 Create Database USE [master] GO /****** Object: Database [Jeff Thompson Sr - POS 410 - IA - KVO] Script Date: 03/27/2012 09:23:56 ******/ CREATE DATABASE [Jeff Thompson Sr - POS 410 - IA - KVO] ON PRIMARY ( NAME = N’Jeff Thompson Sr - POS 410 - IA - KVO’‚ FILENAME = N’D:\MSSQL10_50.MSSQLSERVER\MSSQL\DATA\Jeff Thompson Sr - POS 410 - IA - KVO.mdf’ ‚ SIZE = 2048KB ‚ MAXSIZE = UNLIMITED‚ FILEGROWTH
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candidate key for a relation‚ then the candidate key automatically becomes the primary key. (6) True or False? The primary key referenced by a foreign key must be in a different relation from the foreign key. (7) True or False? A RDBMS (relational database management system) manages metadata. (8) True or False? In XML‚ <!-- doc A --> is a document type declaration. (9) True or False? An XML document may be valid but not well formed. (1) True or False? The datatype specified
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Introduction to Oracle 9i: SQL Name: _______ Junel L Cofino Table of Contents Introduction: I-7 - Relational and Object Relational Database Management System I-10 - System Development Life Cycle I-12 - Relational Database Concept I-20 - Relational Database Properties I-24 - Tables used in the course Chapter 1: Writing Basic SELECT SQL Statements 1-4- Basic Select Statement 1-5- Selecting All Columns 1-6- Selecting Specific Columns
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command? Selected Answer: SELECT HireDate‚ COUNT(*) FROM EMPLOYEE WHERE Salary < 30000; Question 9 5 of 5 points Because SQL stored procedures allow and encourage code sharing among developers‚ stored procedures give database application developers the advantages of less work‚ standardized processing‚ and specialization among developers. Selected Answer: True Question 10 5 of 5 points The SQL command used to create a virtual table is ________.
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Cloud Database and DBaaS Market by Databases (SQL‚ Nosql)‚ Software (Database Application Builder‚ Data Scaling and Replication‚ Back-Up and Recovery‚ Database Encryption)‚ Deployment Models (Iaas‚ Paas‚ Dbaas) and Service Models (Public Cloud‚ Private Cloud‚ Virtual Private Cloud‚ Hybrid Cloud) & Organization Size (Small And Medium‚ Large) - Global Advancements‚ Market Forecasts and Analysis (2014-2019) On 16th APR. 2014 Emergence of innovative database storage offerings such as NoSQL‚ SQL‚ public
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