ROUND function
The ROUND function rounds numbers to the nearest integer or decimal.
The ROUND function can optionally include a second argument as an INTEGER
to indicate
the number of decimal places for rounding, in either direction. When you don't
provide the second argument, the function rounds to the nearest whole number. When the
second argument integer is specified, the function rounds to the nearest
number with integer decimal places of precision.
Syntax
ROUND(number [ , integer ] )
Arguments
 number

A number or expression that evaluates to a number. It can be the
DECIMAL
,FLOAT8
orSUPER
type. Amazon Redshift can implicitly convert other numeric data types.  integer
(Optional) An
INTEGER
that indicates the number of decimal places for rounding in either direction. TheSUPER
data type isn't supported for this argument.
Return type
ROUND returns the same numeric data type as the input number.
When the input is of the SUPER
type, the output retains the same dynamic type as the input while the static type remains the SUPER
type. When the dynamic type of SUPER
isn't a number, Amazon Redshift returns NULL
.
Examples
The following examples use the TICKIT sample database. For more information, see Sample database.
To round the commission paid for a given transaction to the nearest whole number, use the following example.
SELECT commission, ROUND(commission) FROM sales WHERE salesid=10000;
+++  commission  round  +++  28.05  28  +++
To round the commission paid for a given transaction to the first decimal place, use the following example.
SELECT commission, ROUND(commission, 1) FROM sales WHERE salesid=10000;
+++  commission  round  +++  28.05  28.1  +++
To extend the precision in the opposite direction as the previous example, use the following example.
SELECT commission, ROUND(commission, 1) FROM sales WHERE salesid=10000;
+++  commission  round  +++  28.05  30  +++