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ROUND function

PDFRSS

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 or SUPER 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. The SUPER 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 |
+------------+-------+