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Working with Functions and Value Expressions
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column is configured with the TIMESTAMP data type. Suppose you want to change the datetime values to character strings. You can use the CAST expression in your SELECT clause, as shown in the following statement:
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SELECT COMPACT_DISC, CAST(DATE_SOLD AS CHAR(25)) AS CHAR_DATE FROM SALES_DATES WHERE COMPACT_DISC LIKE ('%Blue%')
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This statement converts the DATE_SOLD values from TIMESTAMP values to CHAR values. As you can see, all you need to do is specify the CAST keyword, followed by the parenthetical parameters that identify the source column and the new data type, along with the AS keyword. When you execute this statement, you receive query results similar to what you would see if you had not used CAST:
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COMPACT_DISC -------------------Famous Blue Raincoat Blue Blues on the Bayou CHAR_DATE ------------------Dec 22 2002 10:58AM Dec 22 2002 12:02PM Dec 24 2002 2:15PM
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Notice that you can assign a name to the column that contains the new datetime results. In this case, the new column name is CHAR_DATE.
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You might find that, in your SQL implementation, when a datetime value is converted, the format changes slightly. For example, in SQL Server, a date value is expressed numerically and a time value is expressed in a 24-hour clock (military time), but when the value is converted to a CHAR data type, the time value is expressed in alphanumeric characters, and the time is expressed in a 12-hour clock (A.M. and P.M.).
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Use Special Values
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In 6, I discuss special values that SQL supports that allow you to determine the current users. A special value exists for each type of user. These values act as placeholders for the actual user-related value. You can use them in expressions to return the value of the specific user. SQL supports five special values, which are described in Table 10-3. (See 6 for more information about the various types of SQL users.) The special values can be used in different ways in an SQL database, such as for establishing connections or running a stored procedure. The special value, rather than the actual user name, is embedded in the code to allow the code to remain flexible from one situation to another. Another way in which a special value can be used is to store user data in a table. To illustrate this, let s take a look at the CD_ORDERS table in Figure 10-4. Each time a row is added to the table, a value for CURRENT_USER is inserted into the ORDERED_BY column. This makes it handy to track which user has placed the order. If you
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SQL: A Beginner s Guide
Value
CURRENT_USER
Description
Identifies the current user identifier. If the SQL-session user identifier is the current user identifier, then CURRENT_USER, USER, and SESSION_USER all have the same value, which can occur if the initial identifier pair is the only active user identifier/ role name pair (the pair at the top of the authentication stack). Identifies the current user identifier. USER means the same thing as CURRENT_USER. Identifies the current SQL-session user identifier. Identifies the current role name. Identifies the current operating system user who invoked an SQL module.
USER SESSION_USER CURRENT_ROLE SYSTEM_USER
Table 10-3 Using SQL:2006 Special Values were to look at the table definition, you would see that a default value had been defined for the ORDERED_BY column, as shown in the following CREATE TABLE statement:
CREATE TABLE CD_ORDERS ( CDTITLE VARCHAR(60), ORDERED INT, ORDERED_BY CHAR(30) DEFAULT CURRENT_USER );
If you were to insert data into this table, you would have to specify only a CD_TITLE value and an ORDERED value. The ORDERED_BY value would be inserted automatically,
CD_TITLE: VARCHAR(60) Famous Blue Raincoat Blue Court and Spark Past Light That Christmas Feeling Patsy Cline: 12 Greatest Hits Out of Africa Leonard Cohen The Best of Fundamental Blues on the Bayou
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