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Note that a duration can t be stored in the database, however, because DB2 doesn t have an explicit DURATION data type. SQL Server also supports date/time data and accepts a variety of different formats for date and time constants. The DBMS automatically accepts all of the alternate formats, and you can intermix them if you like. Here are some examples of legal SQL Server date constants:
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March 15, 2008 Mar 15 2008 3/15/2008 3-15-08 2008 MAR 15
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Format Name American European Japanese ISO
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TABLE 5-5
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Date Format mm/dd/yyyy dd.mm.yyyy yyyy-mm-dd yyyy-mm-dd
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5:
SQL Basics
and here are some legal time constants:
15:30:25 3:30:25 PM 3:30:25 pm 3 PM
Oracle dates and times are also written as string constants, using this format:
15-MAR-90
You can also use Oracle s built-in TO_DATE() function to convert date constants written in other formats, as in this example:
SELECT NAME, AGE FROM SALESREPS WHERE HIRE_DATE = TO_DATE('JUN 14 2007', 'MON DD YYYY');
PART II
The SQL2 standard specifies a format for date and time constants, based on the ISO format in Table 5-5, except that time constants are written with colons instead of periods separating the hours, minutes, and seconds. The SQL Standard TIMESTAMP type, not shown in the table, has a format of yyyy-mm-dd-hh.mm.ss.nnnnnn for example 1960-0519-14.18.08.048632 represents 5/19/60 at roughly 2:18 p.m.
Symbolic Constants
In addition to user-supplied constants, the SQL includes special symbolic constants that return data values maintained by the DBMS itself. For example, in some DBMS brands, the symbolic constant CURRENT_DATE yields the value of the current date and can be used in queries such as the following, which lists the salespeople whose hire date is still in the future:
SELECT NAME, HIRE_DATE FROM SALESREPS WHERE HIRE_DATE > CURRENT_DATE;
The SQL1 standard specified only a single symbolic constant (the USER constant described in 15), but most SQL products provide many more. Generally, a symbolic constant can appear in a SQL statement anywhere that an ordinary constant of the same data type could appear. The SQL2 standard adopted the most useful symbolic constants from current SQL implementations and provides for CURRENT_DATE, CURRENT_TIME, and CURRENT_TIMESTAMP (note the underscores) as well as USER, SESSION_USER, and SYSTEM_USER. Some SQL products, including SQL Server, provide access to system values through built-in functions rather than symbolic constants. The SQL Server version of the preceding query is
SELECT NAME, HIRE_DATE FROM SALESREPS WHERE HIRE_DATE > GETDATE();
Built-in functions are described later in this chapter, in the section Built-In Functions.
Part II:
Retrieving Data
Expressions
Expressions are used in the SQL to calculate values that are retrieved from a database and to calculate values used in searching the database. For example, this query calculates the sales of each office as a percentage of its target:
SELECT CITY, TARGET, SALES, (SALES/TARGET) * 100 FROM OFFICES;
and this query lists the offices whose sales are more than $50,000 over target:
SELECT CITY FROM OFFICES WHERE SALES > TARGET + 50000.00;
The ANSI/ISO SQL standard specifies four arithmetic operations that can be used in expressions: addition (X + Y), subtraction (X Y), multiplication (X * Y), and division (X / Y). Parentheses can also be used to form more complicated expressions, like this one:
(SALES * 1.05) - (TARGET * .95)
Strictly speaking, the parentheses are not required in this query because the ANSI/ISO standard specifies that multiplication and division have a higher precedence than addition and subtraction. However, you should always use parentheses to make your expressions unambiguous, because different SQL dialects may use different rules. The parentheses also increase the readability of the statement and make programmatic SQL statements easier to maintain. The ANSI/ISO SQL standard also specifies automatic data type conversion from integers to decimal numbers, and from decimal numbers to floating point numbers, as required. You can thus mix these data types in a numeric expression. Many SQL implementations support other operators and allow operations on character and date data. The SQL standard specifies a string concatenation operator, written as two consecutive vertical bar characters (||), which is supported by most implementations. (A notable exception is SQL Server, which uses the plus sign (+) instead.) If two columns named FIRST_NAME and LAST_NAME contain the values Jim and Jackson , then this DB2 expression:
('Mr./Mrs. ' || FIRST_NAME || ' ' || LAST_NAME)
produces the string Mr./Mrs. Jim Jackson . As already mentioned, DB2 and many other implementations also support addition and subtraction of DATE, TIME, and TIMESTAMP data, for occasions when those operations make sense. This capability has been included in the SQL standard.
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