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PostgreSQL Reference Manual - Volume 1 - SQL Language Reference
by The PostgreSQL Global Development Group
Paperback (6"x9"), 716 pages
ISBN 0954612027
RRP £32.00 ($49.95)

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6.1 Numeric Types

Numeric types consist of two-, four-, and eight-byte integers, four- and eight-byte floating-point numbers, and selectable-precision decimals. Table 6-2 lists the available types.

Table 6-2: Numeric Types
Name Storage Size Description Range
smallint 2 bytes small-range integer -32768 to +32767
integer 4 bytes usual choice for integer -2147483648 to +2147483647
bigint 8 bytes large-range integer -9223372036854775808 to 9223372036854775807
decimal variable user-specified precision, exact no limit
numeric variable user-specified precision, exact no limit
real 4 bytes variable-precision, inexact 6 decimal digits precision
double precision 8 bytes variable-precision, inexact 15 decimal digits precision
serial 4 bytes autoincrementing integer 1 to 2147483647
bigserial 8 bytes large autoincrementing integer 1 to 9223372036854775807

The syntax of constants for the numeric types is described in section 2.1.2 Constants. The numeric types have a full set of corresponding arithmetic operators and functions. Refer to section 7 Functions and Operators for more information. The following sections describe the types in detail.

ISBN 0954612027PostgreSQL Reference Manual - Volume 1 - SQL Language ReferenceSee the print edition