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Create SQL Tables Specify Column Data Types Create User-Defined Types Specify Column Default Values Alter SQL Tables Delete SQL Tables
n an SQL environment, tables are the basic unit of data management. Most SQL programming you do is related either directly or indirectly to those tables. As a result, before you can insert data into your database or modify that data, the appropriate tables must have been created or you must create them. The SQL:2006 standard provides three statements that allow you to define, change, and delete table definitions in an SQL environment. You can use the CREATE TABLE statement to add a table, the ALTER TABLE statement to modify that definition, or the DROP TABLE statement to delete the table and its data from your database. Of these three statements, the CREATE TABLE statement has the most complex syntax. Not only is this because of the various types of tables supported by SQL, but also because a table definition can include many elements. However, despite these complexities, table creation is a fairly straightforward process, once you understand the basic syntax.
Create SQL Tables
As you might recall from 2, SQL supports three types of tables: base tables, derived tables, and viewed tables. Most base tables are schema objects that hold SQL data. Derived tables are the results you see when you request (query) data from the database. Viewed tables are another name for views, which I discuss in 5. You can think of a viewed table as a type of named derived table, with a view definition stored in the schema. In this chapter, you ll be working with base tables. In fact, most of what you ll be directly working with throughout this book (as well as throughout your programming career) are base tables; however, not all base tables are the same. Some are persistent (permanent) and some are temporary. Some are schema objects and some are contained in modules. All module base tables are also temporary tables. SQL supports four types of base tables:
Persistent base tables A named schema object defined by a table definition in a CREATE TABLE statement. Persistent base tables hold the SQL data that is stored in your database. This is the most common type of base table and is often what is being referred to when people mention base tables or tables. A persistent base table always exists as long as the table definition exists, and can be called from within any SQL session.
3:
Creating and Altering Tables
Global temporary tables A named schema object defined by a table definition in a CREATE GLOBAL TEMPORARY TABLE statement. Although the table definition is a part of the schema, the actual table exists only when referenced within the context of the SQL session in which it was created. When the session ends, the table no longer exists. A global temporary table created in one session cannot be accessed from another SQL session. The contents are distinct within each SQL session. Created local temporary tables A named schema object defined by a table definition in a CREATE LOCAL TEMPORARY TABLE statement. Like a global temporary table, the created local temporary table can be referenced only within the context of the SQL session in which it was created and cannot be accessed from another SQL session. However, a global temporary table can be accessed from anywhere within the associated SQL session, whereas a created local temporary table can be accessed only within the associated module. The contents are distinct within that module. Declared local temporary tables A table declared as part of a procedure in a module. The table definition is not contained in the schema and does not exist until that procedure is executed. Like other temporary tables, the declared local temporary table can be referenced only within the context of the SQL session in which it was created.
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