Summary
In this chapter, we concentrated on the SQL Data Definition Language (DDL). DDL is used to create, modify, and remove database objects. There are three main statements in DDL: CREATE, ALTER, and DROP. If you want to use a DB2 database, you may need to learn DDL first to create some database objects. There are many kinds of objects in a DB2 database.
We focused primarily on data types, tables, views, and indexes among the database objects created by DDL. A data type is used to specify the attribute of columns in a table. DB2 has two kinds of data types: built-in data types and user-defined data types. The built-in type is a DB2-supplied data type and falls into three main categories:
Numeric
String (including large object—LOB)
Date-time ...
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