Fixed Precision

Name	Description	Storage Space	Value Range	Literal
DECIMAL	Decimal number with fixed precision. The precision can be as high as 38 bits, but for optimal performance, a precision of less than 18 bits is recommended. Decimal has two input parameters: precision: total number of digits. The default value is 38. scale: number of decimal places. The default value is 0. NOTE: If scale is 0 and precision is 38, the maximum precision is 19 bits.	64 bits	$\text{[math]}$	DECIMAL
NUMERIC	Same as DECIMAL	128 characters		NUMERIC

Name

Description

Storage Space

Value Range

Literal

DECIMAL

Decimal number with fixed precision. The precision can be as high as 38 bits, but for optimal performance, a precision of less than 18 bits is recommended.

Decimal has two input parameters:

precision: total number of digits. The default value is 38.
scale: number of decimal places. The default value is 0.
NOTE:

If scale is 0 and precision is 38, the maximum precision is 19 bits.

64 bits

$\text{[math]}$

DECIMAL

NUMERIC

Same as DECIMAL

128 characters

NUMERIC

**Table 1** Examples of literals
Literal	Data Type
DECIMAL '0'	DECIMAL(1)
DECIMAL '12345'	DECIMAL(5)
DECIMAL '0000012345.1234500000'	DECIMAL(20, 10)

--Create a table containing DECIMAL data.
CREATE TABLE decimal_t1 (dec_col1 DECIMAL(10,3)) ;    

– Insert data of the DECIMAL type.
insert into decimal_t1 values (DECIMAL '5.325');     

--View data.
SELECT * FROM decimal_t1;  
 dec_col1  
---------   
 5.325 
(1 row)    

--Drop a table.
DROP TABLE decimal_t1;  

--Create a NUMERIC type table.
CREATE TABLE tb_numberic_hetu(col1 NUMERIC(9,7));

--Insert data.
INSERT INTO tb_numberic_hetu values(9.12);


--View data.
SELECT * FROM tb_numberic_hetu;
col1    
------------
  9.1200000 
(1 row)