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An SQL session refers to the connection between a user and an SQL agent. During this connection, a sequence of consecutive SQL statements is invoked by this user and then executed. A module is an object that contains SQL statements, routines, or procedures. Modules are discussed in 13 and 17.
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As you can see, you can use a form of the CREATE TABLE statement to create all base table types except declared local temporary tables. Throughout the rest of the chapter, I will primarily be discussing persistent base tables, although I ll be touching on the subject of temporary tables in subsequent chapters. In the meantime, let s take a look at the syntax in a CREATE TABLE statement:
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CREATE [ { GLOBAL | LOCAL } TEMPORARY ] TABLE <table name> ( <table element> [ { , <table element> } . . . ] ) [ ON COMMIT { PRESERVE | DELETE } ROWS ]
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The curly brackets are used to group elements together. For example, in the first line of syntax, the GLOBAL | LOCAL keywords are grouped together. The brackets tell you that you should first decide how to handle the contents within the brackets and then determine how they fit into the clause. In the first line, you should use either GLOBAL or LOCAL along with TEMPORARY. However, the entire clause is optional. The three periods (in the second line) tell you that you can repeat the clause as often as necessary. In this case, you could add as many <table element> clauses as your definition requires.
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The syntax I ve shown here provides only the basics of the CREATE TABLE statement, which is actually far more complex. (The syntax and its explanations take up about 38 pages of the SQL:2006 standard.) Even so, the syntax provided here is enough of a foundation for you to create the majority of tables that you re likely to be using. In the first line of the syntax, you designate whether the table is temporary and you provide a name for the table, so you have three options:
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CREATE TABLE <table name> CREATE GLOBAL TEMPORARY TABLE <table name> CREATE LOCAL TEMPORARY TABLE <table name>
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Depending on the RDBMS in which you re working, you might have to qualify the table name by including a schema name, authorization identifier, or database name (for example, INVENTORY.ARTISTS).
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There are a number of implementation-specific variations regarding temporary tables that are worth mentioning here. Oracle (through 11g) has no LOCAL option for creating a temporary table; data in a temporary table is private to the expressed session. IBM DB2 UDB through 9.1 uses the command, DECLARE GLOBAL TEMPORARY TABLE, to created the global temporary table; there appears to be no designation for creating/declaring a local temporary table. In SQL Server (through 2008), temporary tables are created with the typical CREATE TABLE command, but local temporary table names are prefixed with a single number sign (#table_name), and global temporary table names are prefixed with a double number sign (##table_name).
The second line of the syntax allows you to specify the parts that make up the table, such as columns. (I ll return to that in a moment.) The third line of the syntax applies only if you re creating a temporary table. The clause allows you to specify whether or not the table should be emptied when a COMMIT statement is executed. A COMMIT statement is used in a transaction to commit changes to the database. I discuss transactions in 16. You can think of the <table element> clauses as the meat of a CREATE TABLE statement. It is here that you define columns, constraints, and other elements specific to the table you re creating. You can define one or more <table element> clauses. If you define more than one, you must separate them with commas. Of the elements that you can create, we ll be focusing primarily on columns (in this chapter) and constraints (in 4). Let s take a closer look at the syntax that is used to define a column:
<column name> { <data type> | <domain> } [ <default clause> ] [ <column constraint> ] [ COLLATE <collation name> ]
In the first line of the syntax, you must provide a column name and declare a data type or user-defined domain. I discuss data types in the Specify Column Data Types section later in this chapter, and I discuss domains in 4.
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