Premium Essay

Sql Fundamentals

In:

Submitted By nsu1
Words 1859
Pages 8
SQL Fundamentals
The Structured Query Language (SQL) comprises one of the fundamental building blocks of modern database architecture. SQL defines the methods used to create and manipulate relational databases on all major platforms. At first glance, the language may seem intimidating and complex but it's really not all that bad. In a series of articles over the next few weeks we'll explore the inner workings of SQL together. By the time we're through, you'll have the fundamental knowledge you need to go out there and start working with databases!

This week, our first article in the SQL series provides an introduction to the basic concepts behind SQL and we'll take a brief look at some of the main commands used to create and modify databases. Throughout this article, please keep our goal in mind: we're trying to get the "big picture" of SQL -- not a mastery of the individual commands. We'll provide a few examples for illustrative purposes and explain the theory behind them, but don't feel frustrated if you can't write your own SQL commands after reading this article. We'll cover each of the major commands in detail in future weekly installments. If you'd like a reminder in your e-mail inbox each week when the next article is posted, please take a moment and subscribe to our newsletter.

By the way, the correct pronunciation of SQL is a contentious issue within the database community. In their SQL standard, the American National Standards Institute declared that the official pronunciation is "es queue el." However, many database professionals have taken to the slang pronunciation "sequel." The choice is yours.

SQL comes in many flavors. Oracle databases utilize their proprietary PL/SQL. Microsoft SQL Server makes use of Transact-SQL. However, all of these variations are based upon the industry standard ANSI SQL. In our tutorial series, we'll stick to

Similar Documents

Premium Essay

Sql Fundamentals Oracle

...Exam Name: Exam Type: Exam Code: Oracle Database: SQL Fundamentals Oracle 1Z0-051 Total Questions 114 Question: 1 Which statement is true regarding the INTERSECT operator? A. It ignores NULL values. B. Reversing the order of the intersected tables alters the result. C. The names of columns in all SELECT statements must be identical. D. The number of columns and data types must be identical for all SELECT statements in the query. Answer: D Question: 2 Which three statements are true regarding the data types in Oracle Database 0g/11g? (Choose three.) A. Only one LONG column can be used per table. B. A TIMESTAMP data type column stores only time values with fractional seconds. C. The BLOB data type column is used to store binary data in an operating system file. D. The minimum column width that can be specified for a VARCHAR2 data type column is one. E. The value for a CHAR data type column is blank-padded to the maximum defined column width. Answer: A, D, E Question: 3 Examine the structure of the PROGRAMS table: Name Null? Type ---------- ------------- --------------PROG_ID NOT NULL NUMBER(3) PROG_COST NUMBER(8,2) START_DATE NOT NULL DATE END_DATE DATE Which two SQL statements would execute successfully? (Choose two.) A. SELECT NVL(ADD_MONTHS(END_DATE,1),SYSDATE) FROM programs; B. SELECT TO_DATE(NVL(SYSDATE-END_DATE,SYSDATE)) FROM programs; C. SELECT NVL(MONTHS_BETWEEN(start_date,end_date),'Ongoing') FROM programs; D. SELECT NVL(TO_CHAR(MONTHS_BETWEEN(start_date,end_date))...

Words: 11884 - Pages: 48

Premium Essay

Roaa

...ANNUAL SALARY alias cannot include spaces. The alias should read ANNUAL_SALARY or should be enclosed in double quotation marks. A comma is missing after the LAST_NAME column. Part 2 Note the following location for the lab files: \home\oracle\labs\SQL1\labs If you are asked to save any lab files, save them at this location. To start Oracle SQL Developer, double-click the SQL Developer desktop icon. Before you begin with the practices, you need a database connection to be able to connect to the database and issue SQL queries. Oracle Database 10g: SQL Fundamentals I A - 2 Practice 1: Solutions (continued) 4. To create a new database connection in the Connections Navigator, right-click Connections. Select New Connection from the menu. The New/Select Database Connection dialog box appears. 5. Create a database connection using the following information: a. Connection Name: myconnection b. Username: ora1 c. Password: ora1 d. Hostname: localhost e. Port: 1521 f. SID: ORCL g. Ensure that you select the Save Password check box. Oracle Database 10g: SQL Fundamentals I A - 3 Practice 1: Solutions (continued) You have been hired as a SQL programmer for Acme Corporation. Your first task is to create some reports based on data...

Words: 6452 - Pages: 26

Premium Essay

Database

...needs the following reports: 4. Find the highest, lowest, sum, and average salary of all employees. Label the columns Maximum, Minimum, Sum, and Average, respectively. Round your results to the nearest whole number. Place your SQL statement in a text file named lab_04_04.sql. SELECT ROUND(MAX(salary),0) "Maximum",         ROUND(MIN(salary),0) "Minimum",         ROUND(SUM(salary),0) "Sum",         ROUND(AVG(salary),0) "Average"  FROM   employees;     5. Modify the query in lab_04_04.sql to display the minimum, maximum, sum, and average salary for each job type. Resave lab_04_04.sql as lab_04_05.sql. Run the statement in lab_04_05.sql. SELECT job_id, ROUND(MAX(salary),0) "Maximum",                 ROUND(MIN(salary),0) "Minimum",                 ROUND(SUM(salary),0) "Sum",                 ROUND(AVG(salary),0) "Average"  FROM   employees         GROUP BY job_id;  6. Write a query to display the number of people with the same job. SELECT job_id, COUNT(*)  FROM   employees   GROUP BY job_id;  Generalize the query so that the user in the HR department is prompted for a job title. Save the script to a file named lab_04_06.sql.� SELECT job_id, COUNT(*)  FROM   employees  WHERE  job_id = '&job_title'  GROUP BY job_id;  Oracle Database 10g: SQL Fundamentals I A - 12 Practice 4: Solutions (continued) 7. Determine the number of managers without listing them. Label the column Number of  Managers. Hint: Use the MANAGER_ID column to determine the number of managers. SELECT COUNT(DISTINCT manager_id) "Number...

Words: 569 - Pages: 3

Premium Essay

Nt1330 Unit 1 Assignment 1 Application Of Data-Based Information System

...Whenever we develop various applications using ADO.NET, the requirements will be different with these applications with respect to working with data. Sometimes you will only want to display the data on a form, whereas in some cases that data might be needed to pass on to some other company. Whatever operations you do with the data, fundamental concept of data approach in ADO.NET is the same. In ASP.NET, data access from the database is done by making use of the technology ADO.NET. In this section, let us discuss how to access data using ADO.NET technology. ADO.NET does not depend on live connections continuously As we are aware that in traditional client/server applications, components will be connected to a database and it is kept open while the...

Words: 770 - Pages: 4

Premium Essay

Happy

...M I C R O S O F T T E C H N O L O G Y A S S O C I AT E Student Study Guide EXAM 98-364 Database Administration Fundamentals Preparing for MTA Certification for Cert ca n Certification MICROSOFT TECHNOLOGY ASSOCIATE (MTA TECHNOLOGY ASSOCIATE (MTA) ECHNOLOGY C (MTA A) STUDENT STUDY GUIDE FOR DEVELOPERS UDY F DEVELOPERS 98-364 Database Administration Fundamentals Authors Peggy Fisher (Web Development and Database Administration). Peggy teaches computer science at a rural high school in central, Pennsylvania. Indian Valley High School offers courses in programming (C#, VB, and Java for the AP course), and Web design (Expression Web, HTML, JavaScript, and CSS). Peggy worked for a large insurance company outside Philadelphia, Pennsylvania, prior to leaving the corporate world to join the field of education. She has been at IVHS for the past eight years and truly enjoys her new career. Peggy also teaches part-time at Pennsylvania State University in the Continuing Education program. Her goal in teaching is to instill the love of learning so that her students will graduate and become lifelong learners. Peggy is the co-author of the Web Development Exam Review Kit in the MTA Exam Review Kit series. Patricia Phillips (Lead Author and Project Manager). Patricia taught computer science for 20 years in Janesville, Wisconsin. She served on Microsoft’s National K-12 Faculty Advisory Board and edited the Microsoft MainFunction website for technology teachers for two years...

Words: 11425 - Pages: 46

Premium Essay

Db Testing

...Testing at the data access layer is the point at which your application communicates with the database. Tests at this level are vital to improve not only your overall test strategy, but also your product’s quality. In this presentation you’ll find out what you need to know to test the SQL database engine, stored procedures, and data views. Find out how to design effective automated tests that exercise the complete database layer of your applications. You’ll learn about the most common and vexing defects related to SQL databases and the best tools available to support your testing efforts. Copyright Sammamish Software Services 2003. All rights Reserved 1 8/26/2004 The Data Access Layer Testing at the data access layer is the point at which your application communicates with the database. ! In this presentation we’ll discuss why tests at this level are vital to improve not only your overall test strategy, but also your product’s quality ! Copyright Sammamish Software Services 2003. All rights reserved. 2 How to design effective automated tests that exercise the complete database layer of your applications. Donation Street demo The most common and vexing defects related to SQL database The best tools available to support your testing efforts. A strong foundation in Structured Query Language is becoming increasingly necessary and even required by some companies in today’s data environments. Many test professionals are...

Words: 5030 - Pages: 21

Premium Essay

Asdasasa

...The Characteristics of Databases •  The purpose of a database is to help people track things of interest to them. •  Data is stored in tables, which have rows and columns like a spreadsheet. A database may have multiple tables, where each table stores data about a different thing. •  Each row in a table stores data about an occurrence or instance of the thing of interest. •  A database stores data and relationships. KROENKE AND AUER - DATABASE PROCESSING, 12th Edition © 2012 Pearson Prentice Hall 1-1 Data in Tables KROENKE AND AUER - DATABASE PROCESSING, 12th Edition © 2012 Pearson Prentice Hall 1-2 The Key Characteristic of Databases: Related Tables KROENKE AND AUER - DATABASE PROCESSING, 12th Edition © 2012 Pearson Prentice Hall 1-3 Database Applications KROENKE AND AUER - DATABASE PROCESSING, 12th Edition © 2012 Pearson Prentice Hall 1-4 Database Applications—Forms KROENKE AND AUER - DATABASE PROCESSING, 12th Edition © 2012 Pearson Prentice Hall 1-5 Database Applications—Queries SELECT FROM WHERE LastName, FirstName, EmailAddress STUDENT StudentNumber > 2; KROENKE AND AUER - DATABASE PROCESSING, 12th Edition © 2012 Pearson Prentice Hall 1-6 Database—Reports KROENKE AND AUER - DATABASE PROCESSING, 12th Edition © 2012 Pearson Prentice Hall 1-7 The DBMS KROENKE AND AUER - DATABASE PROCESSING, 12th Edition © 2012 Pearson Prentice Hall 1-8 The Database •  A database is a self-describing collection of integrated...

Words: 570 - Pages: 3

Premium Essay

Fundamentals of Database System

...Addis Ababa Institute of Technology ITSC Fundamentals of Database Systems Laboratory Practice Note: This laboratory practice will be evaluated at the end (10% of final grade) Prepared BY: Tigabu D. Based on the information given below Develop: i) ER diagram for the company ii) Convert the ER diagram you designed in question I in to tables (relational database) iii) Implement the tables and relationships in question ii using a DMBS of below a. Microsoft access 2007/2010/2013 (Select One version) b. My SQL or Windows SQL Server 2005/08/12 (Select One version) Company Information: ■ The company is organized into Departments. Each department has a name, number and an employee who manages the department. We keep track of the start date of the department manager. A department may have several locations. ■ Each department controls a number of Projects. Each project has a unique name, unique number and is located at a single location. ■ We store each Employee’s social security number, address, salary, sex, and Birthdate. ■ Each employee works for one department but may work on several projects. ■ We keep track of the number of hours per week that an employee currently works on each project. . ■ Each employee may have a number of Dependents. ■ For each dependent, we keep track of their name, sex, Birthdate,...

Words: 254 - Pages: 2

Premium Essay

Paper

...Introduction to Oracle9i: SQL Instructor Guide • Volume 1 40049GC11 Production 1.1 October 2001 D33993 Authors Nancy Greenberg Priya Nathan Copyright © Oracle Corporation, 2000, 2001. All rights reserved. This documentation contains proprietary information of Oracle Corporation. It is provided under a license agreement containing restrictions on use and disclosure and is also protected by copyright law. Reverse engineering of the software is prohibited. If this documentation is delivered to a U.S. Government Agency of the Department of Defense, then it is delivered with Restricted Rights and the following legend is applicable: Restricted Rights Legend Use, duplication or disclosure by the Government is subject to restrictions for commercial computer software and shall be deemed to be Restricted Rights software under Federal law, as set forth in subparagraph (c)(1)(ii) of DFARS 252.227-7013, Rights in Technical Data and Computer Software (October 1988). This material or any portion of it may not be copied in any form or by any means without the express prior written permission of Oracle Corporation. Any other copying is a violation of copyright law and may result in civil and/or criminal penalties. If this documentation is delivered to a U.S. Government Agency not within the Department of Defense, then it is delivered with “Restricted Rights,” as defined in FAR 52.227-14, Rights in Data-General, including Alternate III (June 1987). The information in this document...

Words: 33172 - Pages: 133

Premium Essay

Computer Science

...Lyca Lizette M. Sansawi, Abdel Aziz S. BSCS IT-3B The mechanism through which the records or data at one level is related to the changed format of the same data at another level is known as mapping. When we associate one form of data at the external level with the same data in another form is know as the external/conceptual mapping of the data. (We have seen examples of external/conceptual mapping in the previous lecture) same way when data at the conceptual level is correlated with the same data at the internal level, this is called the conceptual/Internal mapping. When you connect to SQL Server or SQL Azure, you need to specify a target database for migration. If you have multiple Access databases you can map them to multiple SQL Server databases (or schemas) or to multiple schemas under the connected SQL Azure database. A data definition language or data description language (DDL) is syntax similar to a computer programming language for defining data structures especially database schemas. Schema objects do not have a one-to-one correspondence to physical files on disk that store their information. However, Oracle databases store schema objects logically within atablespace of the database. The data of each object is physically contained in one or more of the tablespace's datafiles. For some objects (such as tables, indexes, and clusters) a database administrator can specify how much disk space the Oracle RDBMS allocates...

Words: 643 - Pages: 3

Premium Essay

Pt2520 Unit 2 Dl Paper

...1. What does DDL stand for? List the SQL DDL statements Data Definition Language, is used to remove database objects such as tables, indexes and users. It is necessary to be conscious of the database you are working in before issuing SQL commands such as DDL that can manipulate data. Create, alter and drop schema objects are considered DDL statements. Chapple, M. (2015). Data Defintion Language. Retrieved June 7, 2015. 2. What is a user-defined function? User defined functions in SQL is simply a programmed routine which its parameters are set by the user of a system such as a database or spreadsheet program. In order to utilize user-defined functions, the user must have been granted CREATE function permissions to create, alter or drop user-defined functions. 3. What is the relationship between a trigger and a table or view?...

Words: 532 - Pages: 3

Free Essay

Web Server Application Attacks

...traffic. Most of the attacks are broad, and comes in many versions that fall into similar categories. Companies are making their web servers more secure, so attacks are moving to the vulnerability of web application flaws. Below are types of attacks on a web server 1 Web application vulnerabilities can be categorized as follows; Web server vulnerabilities, Manipulation of URLs, Exploitation of weaknesses in session identifiers and authentication systems, HTML code Injection and Cross-Site Scripting, and SQL Injection. SQL injection is a technique often used to attack data driven applications. This is done by including portions of SQL statements in an entry field in an attempt to get the website to pass a newly formed rogue SQL command to the database. SQL injection is a code injection technique that exploits security vulnerability in an application's software. The vulnerability happens when user input is either incorrectly filtered for string literal escape characters embedded in SQL statements...

Words: 1565 - Pages: 7

Premium Essay

Study Guide

...® OCA Oracle Database 11g: SQL Fundamentals I Exam Guide (Exam 1Z0-051) ABOUT THE AUTHORS John Watson (Oxford, UK) works for BPLC Management Consultants, teaching and consulting throughout Europe and Africa. He was with Oracle University for several years in South Africa, and before that worked for a number of companies, government departments, and NGOs in England and Europe. He is OCP qualified in both database and Application Server administration. John is the author of several books and numerous articles on technology and has 25 years of experience in IT. Roopesh Ramklass (South Africa), OCP, is an independent Oracle specialist with over 10 years of experience in a wide variety of IT environments. These include software design and development, systems analysis, courseware development, and lecturing. He has worked for Oracle Support and taught at Oracle University in South Africa for several years. Roopesh is experienced in managing and executing IT development projects, including infrastructure systems provisioning, software development, and systems integration. About the Technical Editor Bruce Swart (South Africa) works for 2Cana Solutions and has over 14 years of experience in IT. Whilst maintaining a keen interest for teaching others, he has performed several roles including developer, analyst, team leader, administrator, project manager, consultant, and lecturer. He is OCP qualified in both database and developer roles. He has taught at Oracle University...

Words: 150089 - Pages: 601

Premium Essay

Database Management System Tutorial

...Database Management System Tutorial.pdf Free Download Here Database Management System [DBMS] Tutorial http://www.tutorialspoint.com/dbms/dbms_tutorial.pdf i DATABASE MANAGEMENT SYSTEM [DBMS] TUTORIAL Simply Easy Learning by tutorialspoint.com tutorialspoint.com Tutorial: Introduction to Database Systems http://home.hit.no/~hansha/documents/database/training/Introduction%20to%20Database%20Systems/Introduction%20to%20 Database%20Systems.pdf Tutorial: Introduction to Database Systems ! 3.2! ... The!software!used!to!do!this!grouping!is!called!arelational!database!management!system.!The!term! COURSE: DATABASE MANAGEMENT SYSTEM - Gi?i thi?u http://ccs1.hnue.edu.vn/hoanpt/DBMS/REF/MBA%20758%20Database%20Management%20System.pdf There will be tutorial lectures to organized for this course. ... MBA 758 DATABASE MANAGEMENT SYSTEM •Database normalization is usually performed when designing a CP 4105 Database Management System https://www.bitmesra.ac.in/UploadedDocuments/Menu_634642043645840000_CS4105%20Database%20Management%20S ystems%20Tutorial.doc semester-iv. cs 4105 database management system tutorial sheet. department of computer science and engineering, b. i. t. mesra. introduction. 1. discuss the main ... Got a MySpace Page? Table of Contents - Idea2IC http://www.idea2ic.com/File_Formats/Database%20Tutorial.pdf Database Management Systems This is the main screen you'll see when opening up Access to view an existing database. The outer part is the database management system ....

Words: 455 - Pages: 2

Premium Essay

Doc Remove Delibitablement

...First year ENGINEER – ENG1 Modules | credits | Hours | Functional Analysis | 3,5 | 48 | Algebra for Engineers | 2,5 | 32 | Probability 1 | 3,5 | 48 | Statistical Decision (courses +Tuto) | 3,5 | 48 | Microprocessor System | 3 | 40 | Signal Transmission | 2,5 | 32 | Data Transmission | 2,5 | 32 | Workshop on Linux | 3 | 40 | Databases | 3 | 40 | TOEIC 1 | 2,5 | 32 | Advanced Maintenance | 2,5 | 32 | Numerical Analysis | 2,5 | 32 | Operations Research | 2,5 | 32 | Servo (Tuto) | 2,5 | 32 | Servo (Courses) | 2,5 | 32 | Algorithm (Data Structure) | 2,5 | 32 | Algorithm oriented object (Tuto, C++ Language) | 3 | 40 | Operating System (Theories and Fundamental) | 2,5 | 32 | WAN (courses + Tuto) | 4,5 | 60 | Method of Analysis 1 | 3 | 40 | Programming Workshop C | 2,5 | 32 | Software Engineering workshop (Access, VB) | 3 | 40 | Management Workshop for Science Engineer | 2 | 24 | Entrepreneurship | 1,5 | 20 |   |   |   | TOTAL | 63,5 | 832 | ------------------------------------------------- OBJECT ORIENTED ALGORITHM ------------------------------------------------- (Hands-On in Language C + +) CHAPTER I: GENERAL ON CLASS I. Notion of class • Generality of P.O.O • Incompatibility C / C + + II. Property of the member functions • Defaults • Member functions in-line • Transmission of object as argument III. Object assignment IV. Object Constructors and Destructors V. Object initialization VI. The copy...

Words: 2262 - Pages: 10