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The columns of the newly created table are defined in the body of the CREATE TABLE statement. The column definitions appear in a comma-separated list enclosed in parentheses. The order of the column definitions determines the left-to-right order of the columns in the table. In the CREATE TABLE statements supported by the major DBMS brands, each column definition specifies the following: I Column name. Used to refer to the column in SQL statements. Every column in the table must have a unique name, but the names may duplicate those of columns in other tables. I Data type. Identifies the kind of data that the column stores. Data types were discussed in 5. Some data types, such as VARCHAR and DECIMAL, require additional information, such as the length or number of decimal places in the data. This additional information is enclosed in parentheses following the keyword that specifies the data type.

Figure 13-1.

13:

17. Delete all rows in the RENTAL_TOTAL table. 18. Delete the Japanese Language rows that you created in question 15. 19. Copy 1 of Movie 1 (MOVIE_ID=1, COPY_NUMBER=1) was sold on January 15, 2005. Update the correct row in the MOVIE_COPY table to set DATE_SOLD accordingly. 20. Update the MOVIE table to increase all non-null VHS prices (RETAIL_ PRICE_VHS) by 10 percent.

I Required data. Determines whether the column contains required data, and prevents NULL values from appearing in the column; otherwise, NULL values are allowed. I Default value. Uses an optional default value for the column when an INSERT statement for the table does not specify a value for the column. The SQL2 standard allows several additional parts of a column definition, which can be used to require that the column contains unique values, to specify that the column is a primary key or a foreign key or to restrict the data values that the column may contain. These are single-column versions of capabilities provided by other clauses in the CREATE TABLE statement and are described as part of that statement in the following sections. Here are some simple CREATE TABLE statements for the tables in the sample database: Define the OFFICES table and its columns.

crops using a small, more manageable plant: salad cress/mustard. To give you an idea of what you should be looking for at the garden center, here are the seeds that I used, pictured in Figure 18-6.

CREATE TABLE (OFFICE CITY REGION MGR TARGET SALES OFFICES INTEGER NOT NULL, VARCHAR(15) NOT NULL, VARCHAR(10) NOT NULL, INTEGER, MONEY, MONEY NOT NULL)

DATABASE STRUCTURE CREATE TABLE (ORDER_NUM ORDER_DATE CUST REP MFR PRODUCT QTY AMOUNT ORDERS INTEGER NOT NULL, DATE NOT NULL, INTEGER NOT NULL, INTEGER, CHAR(3) NOT NULL, CHAR(5) NOT NULL, INTEGER NOT NULL, MONEY NOT NULL)

The CREATE TABLE statement for a given table can vary slightly from one DBMS brand to another, because each DBMS supports its own set of data types and uses its own keywords to identify them in the column definitions. In addition, the SQL2 standard allows you to specify a domain instead of a data type within a column definition. (Domains were described in 11.) A domain is a specific collection of valid data values, which is defined within the database and assigned a name. The domain definition is based on one

Security has become an essential consideration in modern computer systems. Nothing can be more embarrassing to an organization than a media story regarding sensitive data or trade secrets that were electronically stolen from their computer systems. Recent federal security legislation places signi cant restrictions on the use of personal information. In California, a new law requires that noti cation be sent to any California resident who might have had their data compromised. The new laws signi cantly add to the expense and embarrassment related to the cleanup effort, and it is very likely that stricter laws will be passed at the state and federal levels in the near future.

of the DBMS supported data types but performs additional data-value checking that restricts the legal values. For example, if this domain definition appeared in a SQL2-compliant database:

CREATE DOMAIN VALID_OFICE_ID INTEGER CHECK (VALUE BETWEEN 11 AND 99)

CREATE TABLE (OFFICE CITY REGION MGR TARGET SALES OFFICES VALID_OFFICE_ID NOT NULL, VARCHAR(15) NOT NULL, VARCHAR(10) NOT NULL, INTEGER, MONEY, MONEY NOT NULL)