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3.2 Table Creation
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The SQL command to create tables is CREATE TABLE. If you create a table, you must specify a name for the new table, followed by a specification of all table columns. The columns must be specified as a commaseparated list between parentheses. You might also create a new table by inheriting properties from an existing one.
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Note The right to create tables in an Oracle database is not granted to everyone; you need some additional system privileges. If you get error messages when you try to create tables, contact your database administrator or check Oracle Database Administrator s Guide in the online documentation.
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The basic syntax of the CREATE TABLE command is shown in Figure 3-1.
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Figure 3-1. A CREATE TABLE basic command syntax diagram
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Note Figure 3-1 does not show the complete syntax of the CREATE TABLE command. Just for fun, check out Oracle SQL Reference for the amount of documentation describing the CREATE TABLE command. 7 of this book will revisit this command with the full syntax and more details.
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Column specifications normally consist of several components. Figure 3-2 shows the column specification syntax.
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DATA DEFINITION, PART I
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Figure 3-2. Column specification syntax diagram Each column specification starts with a column name, followed by the datatype (discussed in the next section). If you add the optional expression NOT NULL to a column definition, each future row of the table you are creating must have a value specified for this column, and you will not be able to update future rows by removing a value for this column. In other words, you define the column to be a mandatory attribute. The NOT NULL addition is an example of a constraint. You can specify many additional constraints in the CREATE TABLE command. The other types of constraints are UNIQUE, CHECK, PRIMARY KEY, and FOREIGN KEY. 7 will discuss these options of the CREATE TABLE command.
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3.3 Datatypes
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Oracle supports many standard datatypes, as you will see if you take a look at the Oracle documentation. Some Oracle datatypes look very similar; some are even synonyms for each other. These datatypes are supported for compatibility purposes of Oracle with other DBMSs or with the ANSI/ISO SQL standard. For example, INT and INTEGER are synonyms for NUMBER(38). Some datatypes are very specific in nature, making them irrelevant for us at this point in time. This section covers only the most common and widely used Oracle datatypes. In general, there are three categories of column data: numbers (numeric data), text (alphanumeric data), and time-related data. The most important corresponding Oracle datatypes are NUMBER, VARCHAR or VARCHAR2, and DATE, respectively. Table 3-1 shows some examples of the NUMBER datatype. Table 3-1. NUMBER Datatype Examples
Example
NUMBER(4) NUMBER(6,2)
Description
An integer with a maximum length of four digits A number with a maximum precision of six digits; at most two digits behind the decimal point A multiple of thousand with at most seven digits Identical to NUMBER(38,*) Identical to NUMBER(38,5)
NUMBER(7,-3) NUMBER NUMBER(*,5)
Oracle offers a number of alphanumeric datatypes. Depending on the Oracle version you are using, there are some differences due to the evolution of the ANSI/ISO SQL standard over the years. For example, since Oracle7, the two datatypes VARCHAR and VARCHAR2 are identical, but this could change in a
DATA DEFINITION, PART I
future Oracle release. If you create a table and you use the VARCHAR datatype, the Oracle DBMS translates VARCHAR to VARCHAR2 on the fly. Therefore, this book refers to only the VARCHAR2 datatype. In cases where the maximum size of the VARCHAR2 datatype (4000) is insufficient for a specific column, you can use the CLOB (Character Large OBject) datatype. Table 3-2 shows some simple examples of character datatypes. Table 3-2. Character Datatype Examples
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