DB2 SQL Workshop for Experienced Users Schulung

Introduction

• Identify the purpose of the clauses in the SELECT statement
• Describe the key differences among the IBM DB2 platforms
• Describe and use some of the OLAP features of DB2, such as GROUPING functions like CUBE and ROLLUP, and the RANK, DENSE_RANK and ROW_NUMBER functions

Create Objects

• Code statements to: Create tables and views, Alter tables, Create indexes, Implement referential integrity (RI), and Define triggers and check constraints
• Identify impacts and advantages of referential integrity, including impacts of delete rules
• Identify considerations when using triggers and check constraints
• Define and make use of INSTEAD OF triggers

Join

• Retrieve data from more than one table via inner and outer joins
• Use outer joins (LEFT, RIGHT, FULL)
• Use ANTI JOINS
• Join a table to itself
• Use UNION and UNION ALL
• Use EXCEPT and INTERCEPT

CASE, CAST, Summary Tables, and Materialized Query Tables

• Identify when CASE expressions can be used
• Code CASE expressions in SELECT list and in the WHERE clause
• Identify when CAST specifications can be used
• Identify the advantages of using Summary (Materialized Query) Tables and Temporary tables
• Identify the advantages of using Materialized Query Tables (MQTs)
  • Identify when and how to use Temporary tables

Using Subqueries

• Code subqueries using the ALL, ANY/SOME, and EXISTS keywords
• Code correlated subqueries
• Choose the proper type of subquery to use in each case

Scalar Functions

• Extend your knowledge of scalar functions which: Manipulate arithmetic data, Manipulate date values, and Manipulate character data
• Examples of scalar functions that are addressed in this course:
  • SUBSTR
  • POSSTR
  • COALESCE/VALUE
  • DECIMAL
  • ROUND
  • DIGITS
  • CHAR
  • DATE/TIME

Table Expressions and Recursive SQL

• Identify reasons for using table expressions and recursive SQL
• Use nested and common table expressions
• Identify the difference between views and table expressions
• Code recursive SQL
• Control the depth of recursion when coding recursive SQL

UDTs/UDFs and Performance

• Describe the concepts behind User-Defined Types, User-Defined Functions and Stored Procedures
• Predict when queries will use indexes to get better performance
• Identify concepts of predicate processing
• State introductory concepts about index structure
• State general best practices advice