PostgreSQL tutorial: PostgreSQL data types.

Preamble

Below is a list of data types available in PostgreSQL, which includes string, numeric, and date/time type.

String data types

Below are String data types in PostgreSQL :

Syntax of data types	Explanation
char (size)	Where size is the number of characters to store. A string of fixed lengths. Space is added to the right to the size of the characters.
character (size)	Where size is the number of characters to store. A string of fixed lengths. Space is added to the right to the size of the characters.
var symbol (size)	Where size is the number of characters to store. A string of variable lengths.
character varying(size)	Where size is the number of characters to store. A string of variable lengths.
text	The string of variable length.

Numerical data types

Below are the numeric data types in PostgreSQL:

Syntax of data types	Explanation
bit(size)	Bit string of fixed length, where size is the length of a string of bits.
varbit(size) bit varying(size)	Bit string of variable length, where size is the length of a string of bits.
smallint	Equivalent to int2. 2-byte integer with a sign.
int	Equivalent to int4. 4-byte integer with a sign.
integer	Equivalent to int4. 4-byte integer with a sign.
bigint	A large integer value, equivalent to int8. An 8-byte integer with a sign.
smallserial	A small integer value with auto-increment equivalent to serial2. 2-byte integer with a sign, autoincrement.
serial	Auto-incremental integer value, equivalent to serial4. 4-byte integer with a sign, auto-incremental.
bigserial	Large auto-incremental integer value equivalent to serial8. 8-byte integer with a sign, auto-incremental.
numeric(m,d)	Where m is the total number of digits, and d is the number after the decimal fraction.
double precision	8 bytes, double-precision, floating-point number.
real	4-byte floating-point single-precision number.
money	Cost of currency.
bool	Logical logical data type – true or false.
boolean	Logical logical data type – true or false.

Date/Time Types of data

Below is the date/time of the data types in PostgreSQL:

Syntax of data types	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 the timestamptz.
time	Displayed as «HH:MM:SS» without a time zone.
time without time zone	Displayed as «HH:MM:SS» without a time zone.
time with time zone	Displayed as «HH:MM:SS-TZ» with the time zone. Equivalent to the time zone.

Understanding Advanced Datatypes in PostgreSQL

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