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TRUNC Function

SQL Server 2012

SQL Server 2008 R2

Truncates a number to an integer by removing the decimal, or fractional, part of the number.


TRUNC(<number>,<num_digits>)

Parameters

Term	Definition
number	The number you want to truncate.
num_digits	A number specifying the precision of the truncation; if omitted, 0 (zero)

Return Value

A whole number.

Remarks

TRUNC and INT are similar in that both return integers. TRUNC removes the fractional part of the number. INT rounds numbers down to the nearest integer based on the value of the fractional part of the number. INT and TRUNC are different only when using negative numbers: TRUNC(-4.3) returns -4, but INT(-4.3) returns -5 because -5 is the smaller number.

Example

The following formula returns 3, the integer part of pi.

=TRUNC(PI())

The following formula returns -8, the integer part of -8.9.

=TRUNC(-8.9)

Reference

ROUND Function

ROUNDUP Function

ROUNDDOWN Function

MROUND Function

INT Function

Other Resources

Math and Trig Functions (DAX)

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