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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: 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 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.
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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
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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
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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
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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.
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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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If a single quote is to be included in the constant text, it is written within the constant as two consecutive single quote characters. Thus this constant value: 'I can''t' becomes the seven-character string "I can't". Some SQL implementations, such as SQL Server and Informix, accept string constants enclosed in double quotes (". . ."): "Jones, John J." "New York" "Western"
Unfortunately, the double quotes pose portability problems with other SQL products, including some unique portability problems with SQL/DS. SQL/DS allows column names containing blanks and other special characters (in violation of the ANSI/ISO standard). When these characters appear as names in a SQL statement, they must be enclosed in double quotes. For example, if the NAME column of the SALESREPS table were called "FULL NAME" in a SQL/DS database, this SELECT statement would be valid: SELECT "FULL NAME", SALES, QUOTA FROM SALESREPS WHERE "FULL NAME" = 'Jones, John J.' The SQL2 standard provides the additional capability to specify string constants from a specific national character set (for example, French or German) or from a user-defined character set. These capabilities have not yet found their way into mainstream SQL implementations.
Date and Time Constants
In SQL products that support date/time data, constant values for dates, times, and time intervals are specified as string constants. The format of these constants varies from one DBMS to the next. Even more variation is introduced by the differences in the way dates and times are written in different countries.
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DB2 supports several different international formats for date, time, and timestamp constants, as shown in Table 5-5. The choice of format is made when the DBMS is installed. DB2 also supports durations specified as "special" constants, as in this example: HIRE_DATE + 30 DAYS 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: March 15, 1990 Mar 15 1990 3/15/1990 3-15-90 1990 MAR 15
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