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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