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1. Open the client application for your RDBMS and connect to the INVENTORY database. 2. You are going to create an SQL query that uses the three SQL/XML functions to format
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XML that contains an element for each CD in the COMPACT_DISCS table, with each element including the ID of the CD, followed by a separate element containing the title of the CD. Enter and execute the following statement:
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SELECT XMLELEMENT(NAME CD, XMLATTRIBUTE(COMPACT_DISC_ID AS ID), XMLFOREST(CD_TITLE as Title)) FROM COMPACT_DISCS ORDER BY COMPACT_DISC_ID; 3. The output produced should look something like the following listing. Note that in the
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interest of space, only the first two CDs are shown.
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<CD ID='101'> <Title>Famous Blue Raincoat</Title> </CD> <CD ID='102'> <Title>Blue</Title> </CD> 4. Close the client application.
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In this Try This exercise, the SQL SELECT statement used three SQL/XML functions to format data from the COMPACT_DISCS table into XML. The XMLELEMENT function was used to create an element for each CD. The XMLATTRIBUTE function was used to include the COMPACT_DISC_ID value with the name ID as a value within the CD element. Finally, the XMLFOREST function was used to create an element for the CD_TITLE column.
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18 Self Test
1. What is XML 2. Which of the following are common uses of XML A Displaying database data on a web page B Creation of static web pages C Transmission of database data to another party D Enforcement of business rules on documents 3. How do SQL databases and XML documents vary in terms of data structure 4. If two organizations are both using XML, does that mean that they have a standard way of
exchanging data without having to create interface software
5. Which of the following are valid type modifiers for the XML data type A DOCUMENT B SEQUENCE C SQLXML D CONTENT 6. What are the valid secondary type modifiers for the SEQUENCE type modifier 7. Which of the following SQL/XML functions creates an element based on a table column A XMLQUERY B XMLELEMENT C XMLFOREST D XMLDOCUMENT E XMLPARSE 8. Which XML schema type is mapped from the SQL NUMERIC data type A xs:integer B xs:float C xs:decimal D xs:double
SQL: A Beginner s Guide
9. Which XML schema type is mapped from the SQL DATE data type A xs:dateTime B xdt:yearMonthDuration C xs:time D xs:date E xdt:dat-TimeDuration 10. What are the two ways that null values from the database can be represented by SQL/XML A Absent document B Absent element C xsi:null= true D xsi:nil= true E <elementname=nil>
Part
Appendices
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Appendix
Answers to Self Test
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SQL: A Beginner s Guide
1: Introduction to Relational Databases and SQL
1. What is a database A database is a collection of data organized in a structured format defined by metadata that describes the structure. 2. Which of the following objects make up a relation A. Data types B. Tuples C. Attributes D. Forms B and C are the correct answers. 3. A(n) ____________ is a set of data whose values make up an instance of each attribute defined for that relation. Tuple 4. What are the differences between the first normal form and the second normal form According to the first normal form, each attribute of a tuple must contain only one value, each tuple in a relation must contain the same number of values, and each tuple in a relation must be different. According to the second normal form, a relation must be in first normal form and all attributes in a relation must be dependent on the entire candidate key. 5. A relation is in third normal form if it is in second normal form and if it complies with the other guidelines of that form. What are those guidelines All nonkey attributes must be independent of each other and dependent on the key. 6. What are the three primary types of relationships supported by a relational database One-to-one, one-to-many, many-to-many 7. In your data model, you have two relations associated with each other by a many-to-many relationship. How will this relationship be physically implemented in a relational database The relationship will be implemented by adding a third relation between the original two relations in order to create two one-to-many relationships. 8. How does SQL differ from programming languages such as C, COBOL, and Java Programming languages such as C, COBOL, and Java are procedural languages that define how an application s operations should be performed and the order in which they are performed. However, SQL is a nonprocedural language and is more concerned with the results of an operation; the underlying software environment determines how the operations will be processed. Even so, SQL does support some procedural functionality.
Appendix A:
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