. Numbers Numeric datatypes are often the most numerous (Best web design)
. Numbers Numeric datatypes are often the most numerous field datatypes in many database tables. The following different numeric datatype formats are common: . Integers An integer is a whole number such that no decimal digits are included. Some databases allow more detailed specification using small integers and long integers, as well and standard-sized integer datatypes. Figure 3-7 shows three whole number integer datatypes in the fields SINT, INT, and LONGINT. SINT represents a small integer, INT an integer, and LONGINT a long integer datatype. Figure 3-7: Integer, decimal, and floating-point numeric datatypes. . Fixed-length decimals Afixed-length decimal is a number, including a decimal point, where the digits on the right side of the decimal are restricted to a specified number of digits. For example, a DECIMAL(5,2) datatype will allow the values 4.1 and 4.12, but not 4.123. However, the value 4.123 might be automatically truncated or rounded to 4.12, depending on the database engine. More specifically, depending on the database engine the value to the left of the decimal, the number 5 in DECIMAL(5,2), can be interpreted in different ways. In some databases the value 5 limits the number of digits to the left of the decimal point; in other databases, 5 limits the total length of the number, and that total length may include or exclude the decimal point. Thus, in some databases, DECIMAL(5,2) would allow 12345.67 and some databases 12345.67 would not be allowed because the entire number contains too many digits. So, the value 5 can specify the length of the entire number, or only the digits to the left of the decimal point. In Figure 3-7 assume that DECIMAL(5,2) implies 2 decimals with total digits of 5 at most, excluding the decimal point. So in Figure 3-7 the fields DECIMALS5_2 and DECIMALS3_0 allow fixed length decimal values. All INSERT commands adding values to the two DECIMALS5_2 and DECIMALS3_0 fields will fail because decimal length, or overall field length specifications for the datatypes have not been adhered to. create table numbers( SQL> desc numbers Name Type SINT SMALLINT INT INTEGER LONGINT LONG FLT FLOAT(126) SFLT FLOAT(2) WHOLE INTEGER DECIMALS5_2 DECIMAL(5,2) DECIMALS3_0 DECIMAL(3,0) sint smallint ,int integer ,longint long ,flt float ,sflt float(2) ,whole number ,decimals5_2 number(5,2) ,decimals3_0 number(3)); insert into numbers(decimals5_2) values(1234567); insert into numbers(decimals5_2) values(1234.567); insert into numbers(decimals3_0) values(1234.567); 44 Chapter 3
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