Learning Visually with Examples [Electronic resources] نسخه متنی

Chapter 9. Leveraging the Power of SQL

Structured Query Language (SQL) lets users access and manipulate data in relational database management systems. Now that you have learned about the fundamentals of DB2, this chapter shows you how to leverage the power of SQL to obtain and update data that is stored in DB2 databases. The examples provided in this chapter use the

sample database. Chapter 8, The DB2 Storage Model, describes the

sample database in more detail.

In this chapter you will learn about:

• The

  SELECT SQL statement to query data

• The

  INSERT, UPDATE , and

  DELETE SQL statements to modify data

• Recursive SQL statements

• Select query data that just got inserted, updated, or deleted in the same SQL statement

• The

  MERGE SQL statement to combine insert, update, or delete operations in one statement