Getting Started with IBM Data Studio for DB2

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266 Getting Started with IBM Data Studio for DB2 Scalar functions are widely used in SQL statements to do processing of individual or aggregate values. UDFs that receive multiple values as input and return a scalar value are called aggregate functions. Here is an example of using the built-in scalar function concat(): db2 => values CONCAT('Hello', ' World') 1 ----------- Hello World 1 record(s) selected. You can use table functions in several different ways. You can use a table function to operate (with SQL language) on data that is not stored in a database table, or even to convert such data into a table. You can use them to read data from files, from the Web, or from Lotus Notes databases, and return a result table. The information resulting from a table function can be joined with information from other tables in the database, or from other table functions. 9.2 Creating a user-defined function Data Studio supports template based user-defined function creation. There are many predefined routine templates that allow the user to create user-defined functions easily. A routine template is a predefined text with some standard code, comments, best practices, etc. that makes it easy for developers to start creating new user-defined functions. To create a UDF, follow these steps: 1. Create a new data development project as you learned to do in Chapter 8. Name the projectUDF Project. 2. Right-click on the User-Defined Functions folder under UDF Project, and select New -> User-Defined Function as shown in Figure 9.1.
Chapter 9– Developing user-defined functions 267 Figure 9.1 – Creating a new user-defined function 3. In this example, you will create a SQL user-defined function. TypeUDF1 in the Name field, and select the SQL language, as shown in Figure 9.2. 4. Select the Deploy & Run: (Table) Return a result set template. View details about the template in the Template Details tab, or preview the code by opening the DDL tab. This window is shown in Figure 9.2.
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3 Notices This information was deve
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Table of contents 5 Table of conten
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3.3.1 Exporting data...............
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Chapter 7 - Tuning queries ........
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11.4 Community and resources ......
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Preface 13 Keeping your skills curr
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around the world have participated
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17 About the authors Dimple Bhatia
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Contributors 19 The following peopl
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21 Acknowledgements The authors owe
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24 Getting Started with IBM Data St
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100 Getting Started with IBM Data S
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103 Chapter 3 - Maintaining the dat
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159 Chapter 5 - Creating SQL and XQ
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Chapter 5 - Creating SQL and XQuery
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On Success On Error Result Chapter
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193 Chapter 6 - Managing jobs Job m
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Chapter 6 - Managing jobs 207 6.5 R
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Chapter 6 - Managing jobs 209 6.6.2
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213 Chapter 7 - Tuning queries In t
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355 Appendix D - The Sample Outdoor
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Appendix D - The Sample Outdoor Com
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Appendix E - Advanced topics for de
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E.5.4 Data web services artifacts A
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References 391 References [1] HAYES
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References 393 Books and articles 1
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396 Getting started with IBM Data S
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Getting Started with IBM Data Studio for DB2

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