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which is considerably different from the DB2 syntax.
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SQL: The Complete Reference
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Oracle also supports date/time data, with a single data type called DATE. Like SQL Server s DATETIME type, an Oracle DATE is, in fact, a timestamp. Also like SQL Server, the time part of an Oracle DATE value defaults to midnight if no time is explicitly specified. The default Oracle date format is different from the DB2 and SQL Server formats, so the Oracle version of the query becomes:
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SELECT NAME, HIRE_DATE FROM SALESREPS WHERE HIRE_DATE >= '14-JUN-89'
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Oracle also supports limited date arithmetic, so the DB2-style query can also be specified but without the DAYS keyword:
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SELECT NAME, HIRE_DATE FROM SALESREPS WHERE HIRE_DATE >= '30-MAY-89' + 15
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Finally, the ANSI/ISO SQL2 standard added support for date/time data with a set of data types based on, but not identical to, the DB2 types. In addition to the DATE, TIME, and TIMESTAMP data types, the standard specifies an INTERVAL data type, which can be used to store a time interval (for example, a timespan measured in days, or a duration measured in hours, minutes, and seconds). The standard also provides a very elaborate and complex method for dealing with date/time arithmetic, specifying the precision of intervals, adjusting for time zone differences, and so on. As these examples illustrate, the subtle differences in data types among various SQL products lead to some significant differences in SQL statement syntax. They can even cause the same SQL query to produce slightly different results on different database management systems. The widely praised portability of SQL is thus true but only at a general level. An application can be moved from one SQL database to another, and it can be highly portable if it uses only the most mainstream, basic SQL capabilities. However, the subtle variations in SQL implementations mean that data types and SQL statements must almost always be adjusted somewhat if they are to be moved across DBMS brands. The more complex the application, the more likely it is to become dependent on DBMSspecific features and nuances, and the less portable it will become.
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In some SQL statements a numeric, character, or date data value must be expressed in text form. For example, in this INSERT statement, which adds a salesperson to the database:
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SQL Basics
INSERT INTO SALESREPS (EMPL_NUM, NAME, QUOTA, HIRE_DATE, SALES) VALUES (115, 'Dennis Irving', 175000.00, '21-JUN-90', 0.00)
the value for each column in the newly inserted row is specified in the VALUES clause. Constant data values are also used in expressions, such as in this SELECT statement:
SELECT CITY FROM OFFICES WHERE TARGET > (1.1 * SALES) + 10000.00 RETRIEVING DATA
The ANSI/ISO SQL standard specifies the format of numeric and string constants, or literals, which represent specific data values. These conventions are followed by most SQL implementations.
Numeric Constants
Integer and decimal constants (also called exact numeric literals) are written as ordinary decimal numbers in SQL statements, with an optional leading plus or minus sign.
21 -375 2000.00 +497500.8778
You must not put a comma between the digits of a numeric constant, and not all SQL dialects allow the leading plus sign, so it s best to avoid it. For money data, most SQL implementations simply use integer or decimal constants, although some allow the constant to be specified with a currency symbol:
$0.75 $5000.00 $-567.89
Floating point constants (also called approximate numeric literals) are specified using the E notation commonly found in programming languages such as C and FORTRAN. Here are some valid SQL floating point constants:
1.5E3 -3.14159E1 2.5E-7 0.783926E21
The E is read times ten to the power of, so the first constant becomes 1.5 times ten to the third power, or 1500.
String Constants
The ANSI/ISO standard specifies that SQL constants for character data be enclosed in single quotes ( . . . ), as in these examples:
'Jones, John J.' 'New York' 'Western'
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