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Table 2-2 The Types of Objects That Can Be Defined in Each Schema (continued)
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2:
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Working with the SQL Environment
As I said, I ll be discussing most of the items in the table in greater detail later in the book. However, the last three items, which are all related to character sets, are covered only briefly. The character sets, collations, and translations supported by RDBMSs can vary from product to product, and so can the implementation of these features. Throughout this book, the examples and projects I ll be giving you all rely on whatever the default character set is for the product that you re using. If you want to change that character set, either at the default level or at the database or table level, you should first carefully review the product documentation to find out what is supported and how those features are implemented.
Ask the Expert
Q: A:
You describe a domain as a user-defined object that is based on a data type but can include a default value and a constraint. How does this type of domain differ from a domain as you describe it in the relational model In many ways the two are the same, and for all practical purposes, you can think of an SQL domain as a counterpart to a domain in the relational model. There is one subtle difference, however a domain in the relational model is merely a description of the data that can be included in an attribute (column) associated with that particular domain. An SQL domain, on the other hand, restricts the data that can be inserted into the column. An SQL domain does this through the use of constraints, which are validation rules that are part of the system of data integrity. The main idea to keep in mind is that a domain in the relational model is a logical concept, whereas an SQL domain is a physical one. When you talk about schema objects, you mention base tables. Does SQL support any other types of tables The SQL:2006 standard supports four types of tables: base tables, transient tables, derived tables, and viewed tables. The base table is a type of table whose data is actually stored somewhere. In other words, SQL data is stored in a base table. A transient table is a named table that is implicitly created during the evaluation of a query expression or the execution of a trigger. A derived table is the returned table that contains the result of a query (the set of data specific to the query). A viewed table is another name for a view, which is a virtual table whose definition is stored but whose data is derived from base tables at the time the view is called.
Q: A:
Then What Is a Database
As you might have noticed, nowhere in the structure of the SQL environment or a catalog is there mention of a database. The reason for this is that nowhere in the SQL:2006 standard is the term database defined. In fact the only mention of a database, in terms of how it might fit into the structure of the SQL environment, is that you can consider the sites to be the database,
SQL: A Beginner s Guide
although this is offered more as a suggestion than an absolute definition. Although the standard uses the word to refer to SQL as a database language, it never actually defines the term. This approach might be fine for the standard, but in the real world, it can be difficult for an RDBMS to create an SQL environment without creating some sort of component that users can point to and say, Yes, there is the database. And indeed, most products allow you to create, alter, and delete objects that are called databases. In SQL Server, for example, an instance of the DBMS software can manage any number of databases, with each database being a logical collection of database objects that the designer chooses to manage together. Sybase, MySQL, and IBM s DB2 have similar architecture. SQL Server provides a management console called Microsoft SQL Server Management Studio to view and manipulate database objects. The Object Explorer panel along the left margin provides a hierarchical directory-like structure that includes a Database node, with each database shown under it, and objects such as tables shown under each database. Figure 2-3 shows SQL Server Management Studio with the INVENTORY database expanded down to the columns of the ARTIST_CDS table.
Figure 2-3
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