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Value Function
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CURRENT_DATE CURRENT_TIME
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Returns a value that represents the current date. Returns a value that represents the current time. The value includes information about the current time zone, relative to Coordinated Universal Time (UCT), which used to be called Greenwich Mean Time (GMT). Returns a value that represents the current date and time. The value includes information about the current time zone, relative to UCT. Returns a value that represents the current time. Returns a value that represents the current date and time.
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CURRENT_TIMESTAMP LOCALTIME LOCALTIMESTAMP
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Table 10-1 Datetime Value Functions Supported by SQL:2006
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Working with Functions and Value Expressions
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Because the CURRENT_TIMESTAMP datetime value function is supported by both SQL Server and Oracle, let s take a closer look at implementing that one. However, keep in mind that implementing any of the SQL datetime functions is the same process, depending on which functions are supported by the specific SQL implementation in which you re working. By understanding how the CURRENT_TIMESTAMP function works, you ll gain a better understanding of how all functions work. However, be sure to check your implementation s documentation for more information on any of the functions that are supported by that product. Depending on the SQL implementation, you can use the CURRENT_TIMESTAMP function in a SELECT statement to simply retrieve the current timestamp information. As you might expect with anything related to datetime functionality, the way in which you call a function can vary. However, in some cases you might be able to use a statement as basic as the following:
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This statement will retrieve the current time and date in some implementations. In other implementations, you might have to add a FROM clause to the statement in order to retrieve this information. For example, Oracle provides a dummy table called DUAL specifically because it requires a FROM clause in all SELECT statements. Regardless of how you need to write your SELECT statement, in all likelihood using a CURRENT_TIMESTAMP function in this way is not very useful. You ll probably make better use of datetime functions by using them to compare data or to insert data automatically.
NOTE
Most SQL implementations have special functions for handling datetime data. For example, SQL Server provides the getdate function to return the current date, while Oracle provides the SYSDATE special value for the same purpose. The earliest SQL implementations did not include any support for datetime data types, but as soon as relational databases became popular in business applications, users demanded them. This left vendors scrambling to add the new features, and since there was no SQL standard to follow, wide variation across implementations was the result. Products such as MySQL that were developed after the standard have fewer such variations. As always, check your vendor documentation for details.
For example, suppose you wanted the SALES_DATES table (shown in Figure 10-2) to insert the current time and date automatically in your table each time you add a new row. Your table definition might look something like the following:
CREATE TABLE SALES_DATES ( COMPACT_DISC VARCHAR(60), DATE_SOLD DATETIME DEFAULT CURRENT_TIMESTAMP );
In this table definition, the DATE_SOLD column has been assigned a default value that is based on the CURRENT_TIMESTAMP function. Each time a row is added to the table, the datetime value is inserted into the DATE_SOLD column for that row. As a result, you can
SQL: A Beginner s Guide
create INSERT statements that specify only the COMPACT_DISC value. The current date and time are then automatically added to the DATE_SOLD column at the time the row is added.
Use Value Expressions
A value expression is a type of expression that returns a data value. The expression can include column names, values, mathematical operators, keywords, or other elements that together create a sort of formula, or expression, that returns a single value. For example, you can combine the values in two columns to create one value, or you can perform operations on the value in one column to create a new value. In this section, we will look at numeric value expressions as well as the CASE and CAST value expressions. To demonstrate how several of these expressions work, we will use the CD_TRACKING table, shown in Figure 10-3.
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