Data Types

The following is a list of datatypes available in PostgreSQL, which includes string, numeric, and date/time datatypes.

String Datatypes

The following are the String Datatypes in PostgreSQL:

Data Type Syntax	Explanation
char(size)	Where *size* is the number of characters to store. Fixed-length strings. Space padded on right to equal *size* characters.
character(size)	Where *size* is the number of characters to store. Fixed-length strings. Space padded on right to equal *size* characters.
varchar(size)	Where *size* is the number of characters to store. Variable-length string.
character varying(size)	Where *size* is the number of characters to store. Variable-length string.
text	Variable-length string.

Numeric Datatypes

The following are the Numeric Datatypes in PostgreSQL:

Data Type Syntax	Explanation
bit(size)	Fixed-length bit string Where *size* is the length of the bit string.
varbit(size) bit varying(size)	Variable-length bit string Where *size* is the length of the bit string.
smallint	Equivalent to int2. 2-byte signed integer.
int	Equivalent to int4. 4-byte signed integer.
integer	Equivalent to int4. 4-byte signed integer.
bigint	Big integer value which is equivalent to int8. 8-byte signed integer.
smallserial	Small auto-incrementing integer value which is equivalent to serial2. 2-byte signed integer that is auto-incrementing.
serial	Auto-incrementing integer value which is equivalent to serial4. 4-byte signed integer that is auto-incrementing.
bigserial	Big auto-incrementing integer value which is equivalent to serial8. 8-byte signed integer that is auto-incrementing.
numeric(m,d)	Where m is the total digits and d is the number of digits after the decimal.
double precision	8 byte, double precision, floating-point number
real	4-byte, single precision, floating-point number
money	Currency value.
bool	Logical boolean data type - true or false
boolean	Logical boolean data type - true or false

Date/Time Datatypes

The following are the Date/Time Datatypes in PostgreSQL:

Data Type Syntax	Explanation
date	Displayed as 'YYYY-MM-DD'.
timestamp	Displayed as 'YYYY-MM-DD HH:MM:SS'.
timestamp without time zone	Displayed as 'YYYY-MM-DD HH:MM:SS'.
timestamp with time zone	Displayed as 'YYYY-MM-DD HH:MM:SS-TZ'. Equivalent to timestamptz.
time	Displayed as 'HH:MM:SS' with no time zone.
time without time zone	Displayed as 'HH:MM:SS' with no time zone.
time with time zone	Displayed as 'HH:MM:SS-TZ' with time zone. Equivalent to timetz.

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