

PostgreSQL 8.1.4 Documentation  

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PostgreSQL has a rich set of native data types available to users. Users may add new types to PostgreSQL using the CREATE TYPE command.
Table 81 shows all the builtin generalpurpose data types. Most of the alternative names listed in the "Aliases" column are the names used internally by PostgreSQL for historical reasons. In addition, some internally used or deprecated types are available, but they are not listed here.
Table 81. Data Types
Name  Aliases  Description 

bigint  int8  signed eightbyte integer 
bigserial  serial8  autoincrementing eightbyte integer 
bit [ (n) ]  fixedlength bit string  
bit varying [ (n) ]  varbit  variablelength bit string 
boolean  bool  logical Boolean (true/false) 
box  rectangular box in the plane  
bytea  binary data ("byte array")  
character varying [ (n) ]  varchar [ (n) ]  variablelength character string 
character [ (n) ]  char [ (n) ]  fixedlength character string 
cidr  IPv4 or IPv6 network address  
circle  circle in the plane  
date  calendar date (year, month, day)  
double precision  float8  double precision floatingpoint number 
inet  IPv4 or IPv6 host address  
integer  int, int4  signed fourbyte integer 
interval [ (p) ]  time span  
line  infinite line in the plane  
lseg  line segment in the plane  
macaddr  MAC address  
money  currency amount  
numeric [ (p, s) ]  decimal [ (p, s) ]  exact numeric of selectable precision 
path  geometric path in the plane  
point  geometric point in the plane  
polygon  closed geometric path in the plane  
real  float4  single precision floatingpoint number 
smallint  int2  signed twobyte integer 
serial  serial4  autoincrementing fourbyte integer 
text  variablelength character string  
time [ (p) ] [ without time zone ]  time of day  
time [ (p) ] with time zone  timetz  time of day, including time zone 
timestamp [ (p) ] [ without time zone ]  date and time  
timestamp [ (p) ] with time zone  timestamptz  date and time, including time zone 
Compatibility: The following types (or spellings thereof) are specified by SQL: bit, bit varying, boolean, char, character varying, character, varchar, date, double precision, integer, interval, numeric, decimal, real, smallint, time (with or without time zone), timestamp (with or without time zone).
Each data type has an external representation determined by its input and output functions. Many of the builtin types have obvious external formats. However, several types are either unique to PostgreSQL, such as geometric paths, or have several possibilities for formats, such as the date and time types. Some of the input and output functions are not invertible. That is, the result of an output function may lose accuracy when compared to the original input.
Numeric types consist of two, four, and eightbyte integers, four and eightbyte floatingpoint numbers, and selectableprecision decimals. Table 82 lists the available types.
Table 82. Numeric Types
Name  Storage Size  Description  Range 

smallint  2 bytes  smallrange integer  32768 to +32767 
integer  4 bytes  usual choice for integer  2147483648 to +2147483647 
bigint  8 bytes  largerange integer  9223372036854775808 to 9223372036854775807 
decimal  variable  userspecified precision, exact  no limit 
numeric  variable  userspecified precision, exact  no limit 
real  4 bytes  variableprecision, inexact  6 decimal digits precision 
double precision  8 bytes  variableprecision, 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 4.1.2. The numeric types have a full set of corresponding arithmetic operators and functions. Refer to Chapter 9 for more information. The following sections describe the types in detail.
The types smallint, integer, and bigint store whole numbers, that is, numbers without fractional components, of various ranges. Attempts to store values outside of the allowed range will result in an error.
The type integer is the usual choice, as it offers the best balance between range, storage size, and performance. The smallint type is generally only used if disk space is at a premium. The bigint type should only be used if the integer range is not sufficient, because the latter is definitely faster.
The bigint type may not function correctly on all platforms, since it relies on compiler support for eightbyte integers. On a machine without such support, bigint acts the same as integer (but still takes up eight bytes of storage). However, we are not aware of any reasonable platform where this is actually the case.
SQL only specifies the integer types integer (or int) and smallint. The type bigint, and the type names int2, int4, and int8 are extensions, which are shared with various other SQL database systems.
The type numeric can store numbers with up to 1000 digits of precision and perform calculations exactly. It is especially recommended for storing monetary amounts and other quantities where exactness is required. However, arithmetic on numeric values is very slow compared to the integer types, or to the floatingpoint types described in the next section.
In what follows we use these terms: The scale of a numeric is the count of decimal digits in the fractional part, to the right of the decimal point. The precision of a numeric is the total count of significant digits in the whole number, that is, the number of digits to both sides of the decimal point. So the number 23.5141 has a precision of 6 and a scale of 4. Integers can be considered to have a scale of zero.
Both the maximum precision and the maximum scale of a numeric column can be configured. To declare a column of type numeric use the syntax
NUMERIC(precision, scale)
The precision must be positive, the scale zero or positive. Alternatively,
NUMERIC(precision)
selects a scale of 0. Specifying
NUMERIC
without any precision or scale creates a column in which numeric values of any precision and scale can be stored, up to the implementation limit on precision. A column of this kind will not coerce input values to any particular scale, whereas numeric columns with a declared scale will coerce input values to that scale. (The SQL standard requires a default scale of 0, i.e., coercion to integer precision. We find this a bit useless. If you're concerned about portability, always specify the precision and scale explicitly.)
If the scale of a value to be stored is greater than the declared scale of the column, the system will round the value to the specified number of fractional digits. Then, if the number of digits to the left of the decimal point exceeds the declared precision minus the declared scale, an error is raised.
Numeric values are physically stored without any extra leading or trailing zeroes. Thus, the declared precision and scale of a column are maximums, not fixed allocations. (In this sense the numeric type is more akin to varchar(n) than to char(n).) The actual storage requirement is two bytes for each group of four decimal digits, plus eight bytes overhead.
In addition to ordinary numeric values, the numeric type allows the special value NaN, meaning "notanumber". Any operation on NaN yields another NaN. When writing this value as a constant in a SQL command, you must put quotes around it, for example UPDATE table SET x = 'NaN'. On input, the string NaN is recognized in a caseinsensitive manner.
The types decimal and numeric are equivalent. Both types are part of the SQL standard.
The data types real and double precision are inexact, variableprecision numeric types. In practice, these types are usually implementations of IEEE Standard 754 for Binary FloatingPoint Arithmetic (single and double precision, respectively), to the extent that the underlying processor, operating system, and compiler support it.
Inexact means that some values cannot be converted exactly to the internal format and are stored as approximations, so that storing and printing back out a value may show slight discrepancies. Managing these errors and how they propagate through calculations is the subject of an entire branch of mathematics and computer science and will not be discussed further here, except for the following points:
If you require exact storage and calculations (such as for monetary amounts), use the numeric type instead.
If you want to do complicated calculations with these types for anything important, especially if you rely on certain behavior in boundary cases (infinity, underflow), you should evaluate the implementation carefully.
Comparing two floatingpoint values for equality may or may not work as expected.
On most platforms, the real type has a range of at least 1E37 to 1E+37 with a precision of at least 6 decimal digits. The double precision type typically has a range of around 1E307 to 1E+308 with a precision of at least 15 digits. Values that are too large or too small will cause an error. Rounding may take place if the precision of an input number is too high. Numbers too close to zero that are not representable as distinct from zero will cause an underflow error.
In addition to ordinary numeric values, the floatingpoint types have several special values:
Infinity
Infinity
NaN
PostgreSQL also supports the SQLstandard notations float and float(p) for specifying inexact numeric types. Here, p specifies the minimum acceptable precision in binary digits. PostgreSQL accepts float(1) to float(24) as selecting the real type, while float(25) to float(53) select double precision. Values of p outside the allowed range draw an error. float with no precision specified is taken to mean double precision.
Note: Prior to PostgreSQL 7.4, the precision in float(p) was taken to mean so many decimal digits. This has been corrected to match the SQL standard, which specifies that the precision is measured in binary digits. The assumption that real and double precision have exactly 24 and 53 bits in the mantissa respectively is correct for IEEEstandard floating point implementations. On nonIEEE platforms it may be off a little, but for simplicity the same ranges of p are used on all platforms.
The data types serial and bigserial are not true types, but merely a notational convenience for setting up unique identifier columns (similar to the AUTO_INCREMENT property supported by some other databases). In the current implementation, specifying
CREATE TABLE tablename ( colname SERIAL );
is equivalent to specifying:
CREATE SEQUENCE tablename_colname_seq; CREATE TABLE tablename ( colname integer DEFAULT nextval('tablename_colname_seq') NOT NULL );
Thus, we have created an integer column and arranged for its default values to be assigned from a sequence generator. A NOT NULL constraint is applied to ensure that a null value cannot be explicitly inserted, either. In most cases you would also want to attach a UNIQUE or PRIMARY KEY constraint to prevent duplicate values from being inserted by accident, but this is not automatic.
Note: Prior to PostgreSQL 7.3, serial implied UNIQUE. This is no longer automatic. If you wish a serial column to be in a unique constraint or a primary key, it must now be specified, same as with any other data type.
To insert the next value of the sequence into the serial column, specify that the serial column should be assigned its default value. This can be done either by excluding the column from the list of columns in the INSERT statement, or through the use of the DEFAULT key word.
The type names serial and serial4 are equivalent: both create integer columns. The type names bigserial and serial8 work just the same way, except that they create a bigint column. bigserial should be used if you anticipate the use of more than 2^{31} identifiers over the lifetime of the table.
The sequence created for a serial column is
automatically dropped when the owning column is dropped, and
cannot be dropped otherwise. (This was not true in
PostgreSQL releases before 7.3. Note
that this automatic drop linkage will not occur for a sequence
created by reloading a dump from a pre7.3 database; the dump
file does not contain the information needed to establish the
dependency link.) Furthermore, this dependency between sequence
and column is made only for the serial column itself. If
any other columns reference the sequence (perhaps by manually
calling the nextval
function), they will be broken
if the sequence is removed. Using a serial column's sequence
in such a fashion is considered bad form; if you wish to feed several
columns from the same sequence generator, create the sequence as an
independent object.