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DB2 SQL Workshop for Experienced Users (CE131G)

Kursbeschreibung Kurstermine Detaillierter Kursinhalt

Detaillierter Kursinhalt

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