The Language of SQL- P33 ppsx

... Calculated Column The final general use of subqueries is as a calculated column. Let’s say we would like to see a list of customers, along with a count of the number of orders they have placed. This ... format, the IN operator merely lists a number of values in parentheses. There is also a second format for the IN, one in which an entire SELECT state- ment is inserted inside...

Ngày tải lên: 05/07/2014, 05:20

... However, if the same list were sorted alphabetically, then you could quickly locate the desired customer. The idea of sorting data alphabetically applies to many situations, even when the data isn’t ... to emphasize the fact that the sort is ascending, as opposed to descending. Sorting in Descending Order The DESC keyword sorts in an order opposite to ASC. Instead of ascendi...

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... space has been inserted between the phrase LOVE and the percent (%) wildcards on either side. This ensures that there is at least one space on either side of the word. The data brought back from this ... Says I Love You Wildcards The percent (%) symbol is the most common wildcard used with the LIKE operator. However, there are a few other possibilities. These include the und...

Ngày tải lên: 05/07/2014, 05:20

... parentheses on the CREATE PROCEDURE line. Then each SQL statement listed between the BEGIN and END keywords must have a semicolon at the end of the statement. The dollars signs are written after the END keyword ... a specification and a body. The specification component specifies how to communicate with the body component. The body component contains the SQL statements,...

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... consisting of the first line, indicates that the update is to be done on the Customers table. The second section of the statement specifies how the State column is to be updated. The update is ... indexes. Data Definition Language Way back in Chapter 1, we mentioned that there are three main components of the SQL language: DML (Data Manipulation Language) , DDL (Data...

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... to be. Another obvious factor is the existence of current data. Very few organizations have the luxury of designing their databases in a vacuum, apart from what already exists. 195 ■ The third ... not yet addressed the basic issue of how to design a database in the first place. The main questions to address are the following: ■ How shou ld data be organized into a set of...

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... Oracle.doc These three files list all SQL statements in the book for each of the three databases covered. Additionally, these files contain SQL scripts that allow you to create all the data used in the ... running the setup scripts, you can execute any statement in the book and see the same output shown in the book. Specific instructions on how to execute the setup scripts...

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...

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... 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...

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... 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