The Language of SQL- P38 pdf

... notice that the VALUES keyword is used as a prefix to lists of values to be inserted into the table. The statement lists each row of data in a separate set of parentheses. Virginia Jones of Ohio ... take us completely out of the realm of data retrieval and move us squarely into issues surrounding the need to update data. The business of maintaining data doesn’t prese...

Ngày tải lên: 05/07/2014, 05:20

... OS is a registered trademark of Apple Inc. PostgreSQL is a trademark of PostgreSQL Inc and the Regents of the University of California. Allothertrademarksarethepropertyoftheirrespectiveowners. Allimages†CengageLearningunlessotherwisenoted. LibraryofCongressControlNumber:2010925128 ISBN-13:978-1-4354-5751-5 ISBN-10:1-4354-5751-X Course ... Lisa The Language of SQL Larry Rocko...

Ngày tải lên: 05/07/2014, 05:20

... types of columns. The answer is to use a column alias. The term alias means an alternate name. Here’s an example of how to use a column alias with the Microsoft SQL Server version of the previous SELECT statement: SELECT OrderID, FirstName, LastName, FirstName ... Harper The fourth column now has a header. The keyword AS is used to specify a col- umn alias, which immediately...

Ngày tải lên: 05/07/2014, 05:20

... ability to use functions, most of the data available in spreadsheets would be of limited value. The same is true in the world of SQL. Your familiarity with some of the most commonly used SQL functions ... values together. We also discussed the related topic of column aliases, which are often employed when using calculated fields. In the next chapter, we’ll be moving on t...

Ngày tải lên: 05/07/2014, 05:20

... customers whose name contains the word ‘‘bank.’’ In the second situation, we will extend the idea of inexact matches to include the possibility of matching by the sound of a word or phrase. For instance, ... '%LOVE%' 85 One final note about the IN operator. There is a second way to use the IN, which is substantially different from the syntax just discussed. In...

Ngày tải lên: 05/07/2014, 05:20

... sort of code for the sound of the phrase. The first character is always the first letter of the phrase. In this case, the first character is S because both Smith and Smythe begin with an S. The ... are calculated from an analysis of the sound of the rest of the phrase. Internally, the function first removes all vowels and the letter Y. So, the function ta...

Ngày tải lên: 05/07/2014, 05:20

... The AND Operator 72 The OR Operator 73 Using Parentheses 73 Multiple Sets of Parentheses 75 The NOT Operator 76 The BETWEEN Operator 79 The IN Operator 80 Boolean Logic ... area of expertise is with data warehouse systems and reporting tools. He recently developed a suite of BI tools for ASA P Software, a subsidiary of Dell Inc. He holds an MBA from the University of Chi...

Ngày tải lên: 05/07/2014, 05:20

... the introduction of any book they happen to read and then proceed immediately to the first real chapter. With that fact firmly in mind, we will only cover relatively unimportant material in the ... Appendix D, for a description of the files available on the companion Web site. These files list all SQL statements and provide all data shown in the book. You may download the co...

Ngày tải lên: 05/07/2014, 05:20

... that time. Generally speaking, there are three major components of the SQL language. The first is called DML, or Data Manipulation Language. This module of the language allows you to retrieve, ... been The Logic of SQL. This is because, like all computer languages, the language of SQL has much more to do with cold, hard logic than with English vocabulary. Nevertheless,...

Ngày tải lên: 05/07/2014, 05:20

... stored in any number of tables. The term relational is used to indicate that the tables are related to each other. For example, let’s take the simple case of a database consisting of only two tables: ... and the data they contain. The common custom is to display a table as a grid of rows and columns. Each row represents a record in the table. Each column represents a field...

Ngày tải lên: 05/07/2014, 05:20