DB2 SQL Workshop for Experienced Users

dettagliati del corso
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