DB2(R) Universal Database V8 Application Development by David Martineau, Steve Sanyal, Kevin Gashyna, Michael

By David Martineau, Steve Sanyal, Kevin Gashyna, Michael Kyprianou

I purchased this publication since it was once on a instructed interpreting record for numerous DB2 UDB Certifications. I had already had good fortune with of the opposite innovations so i thought this may be valuable in addition. i could not were extra wrong.

After studying Sanders DB2 research advisor for the basics (Test #700) and passing the examination, the applying Developer was once the following logical step. I had already taken a pattern try out and approximately handed so i did not have a lot to visit cross this CERT. After examining this ebook I query no matter if I obtained adequate out of it to move yet.

The first challenge with this booklet, and it truly is my fault for no longer checking, is that the 1st six chapters is suitable to the basics examination and never the applying improvement examination. because the basics are a pre-requisite a few may perhaps say it belongs the following. i do not agree and used to be upset. i'm going to get to the second one part in a minute. The 3rd part contained bonus fabrics which are past the scope of the examination. that's wonderful with me simply because not less than it used to be similar fabric. whereas examining the second one part notwithstanding, correct smack dab in the midst of it, was once a bankruptcy at the Administrative API. The written goal states, "The Administrative API isn't lined within the DB2 program improvement Certification exam." My query, what's it doing right here? If something it may well were installed the final part. the most element is this is indicative of the association of the fabrics inside every one bankruptcy in addition. whereas interpreting the second one component to the booklet i discovered sections of textual content that have been copied from in the e-book and repeated. This wasn't performed to reaffirm a subject matter yet appeared that the author's purpose used to be to exchange it later with assorted textual content. the matter was once that it used to be by no means replaced and used to be simply undeniable fallacious details. This is going past the inspiration of typos and is unacceptable for a publication of this nature. one other challenge is that this ebook contained no evaluation questions and no pattern try out questions and but it truly is alleged to be thought of a certification advisor. whilst i am getting ready for an examination i admire to learn a few fabric after which get suggestions to my point of figuring out prior to relocating on. in a while it supplies me a follow-up learn checklist to study vulnerable parts.

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Extra resources for DB2(R) Universal Database V8 Application Development Certification Guide

Example text

Identity Columns In the majority of applications, a single column within a table represents a unique identifier for that row. Often this identifier is a number that gets sequentially updated as new records are added. In DB2, a feature exists that automatically generates this value on behalf of the user. For example, to automatically generate an employee_id as a sequence, the following definition is used: CREATE TABLE employee( employee_id INT GENERATED ALWAYS AS IDENTITY(START WITH 100, INCREMENT BY 10) ); If GENERATED ALWAYS is specified, then an INSERT statement cannot specify a value for the field.

In the real world, you cannot directly compare pounds and kilograms without converting one of the values into the other type. In DB2, a user-defined function is required to achieve this. Creating user-defined functions is covered in the Application Development with DB2 section. Part 1: DB2 UDB Family Fundamentals 59 60 Part 1: DB2 UDB Family Fundamentals To drop a UDT, use the following syntax: DROP DISTINCT TYPE pound; Selecting Data Types Knowledge of the possible data values and their usage is required to select the correct data type.

In doing so, you should focus on understanding which type would be used in a given situation. There might be cases when multiple types are possible for the given data, but there is always a best choice. For example, if you are storing whole numbers, then an integer-based data type would be more suitable than a string type. 1 shows all data types contained in a tree representation. 1. DB2 Data Types. 52 Part 1: DB2 UDB Family Fundamentals Part 1: DB2 UDB Family Fundamentals 53 Numeric Data Types Numeric data types are used to store integer, decimal, and floating point values.

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