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The name Structured Query Language is actually somewhat of a misnomer. First of all, SQL is far more than a query tool, although that was its original purpose, and retrieving data is still one of its most important functions. SQL is used to control all of the functions that a DBMS provides for its users, including: I Data definition. SQL lets a user define the structure and organization of the stored data and relationships among the stored data items. I Data retrieval. SQL allows a user or an application program to retrieve stored data from the database and use it. I Data manipulation. SQL allows a user or an application program to update the database by adding new data, removing old data, and modifying previously stored data. I Access control. SQL can be used to restrict a user s ability to retrieve, add, and modify data, protecting stored data against unauthorized access. I Data sharing. SQL is used to coordinate data sharing by concurrent users, ensuring that they do not interfere with one another. I Data integrity. SQL defines integrity constraints in the database, protecting it from corruption due to inconsistent updates or system failures. SQL is thus a comprehensive language for controlling and interacting with a database management system. Second, SQL is not really a complete computer language like COBOL, C, C++, or Java. SQL contains no IF statement for testing conditions, and no GOTO, DO, or FOR statements for program flow control. Instead, SQL is a database sublanguage, consisting of about 40 statements specialized for database management tasks. These SQL statements

In everyday life, we consume a tremendous amount of energy. Our lives are styled around consumption consumption of natural resources and consumption of energy. Figure 1-1 dramatically illustrates where all of this energy goes. These figures are for a U.K. lifestyle, but we can take this as being representative for people who live in the developed world. The bulk of our energy consumption goes on space heating 58% this is something that can easily be provided for with passive solar design. Next is water heating, which requires 24% of the energy which we use again, we will see in this book how we can easily heat water with solar energy. So already we have seen that we can meet 82% of our energy needs with solar technologies! The next 13% of our energy is used to provide electrical power for our lights and home. In 10 on solar photovoltaics, we will see how we can produce clean electricity from solar energy with no carbon emissions. The remaining 5% is all used for cooking again we will see in this book how easy it is to cook with the power of the sun! So we have seen that all of our energy needs can be met with solar technologies.

De ning Database Objects Using SQL Syntax Conventions Used in This Data Types SQL:2003 Standard Data Types Vendor Data Type Extensions and Differences NULL Values and Three-Valued Logic Data De nition Language (DDL) Statements The CREATE DATABASE Statement The CREATE TABLE Statement The CREATE INDEX Statement The CREATE VIEW Statement The ALTER TABLE Statement The DROP Statement Quiz Retrieving Data Using Data Query Language (DQL) The Basic SELECT Statement Column Name Aliases Sorting Results Using the WHERE Clause to Filter Rows Comparison Operators Conjunctive Operators Logical Operators Arithmetic Operators Basic SQL Functions Character Functions Mathematical Functions Conversion Functions Aggregate Functions and Grouping Rows GROUP BY Clause