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SET NUMERIC_ROUNDABORT (Transact-SQL)

Specifies the level of error reporting generated when rounding in an expression causes a loss of precision.

Applies to: SQL Server (SQL Server 2008 through current version), Azure SQL Database.

Topic link icon Transact-SQL Syntax Conventions

SET NUMERIC_ROUNDABORT { ON | OFF } 

When SET NUMERIC_ROUNDABORT is ON, an error is generated after a loss of precision occurs in an expression. When OFF, losses of precision do not generate error messages and the result is rounded to the precision of the column or variable storing the result.

Loss of precision occurs when an attempt is made to store a value with a fixed precision in a column or variable with less precision.

If SET NUMERIC_ROUNDABORT is ON, SET ARITHABORT determines the severity of the generated error. This table shows the effects of these two settings when a loss of precision occurs.

Setting

SET NUMERIC_ROUNDABORT ON

SET NUMERIC_ROUNDABORT OFF

SET ARITHABORT ON

Error is generated; no result set returned.

No errors or warnings; result is rounded.

SET ARITHABORT OFF

Warning is returned; expression returns NULL.

No errors or warnings; result is rounded.

The setting of SET NUMERIC_ROUNDABORT is set at execute or run time and not at parse time.

SET NUMERIC_ROUNDABORT must be OFF when you are creating or changing indexes on computed columns or indexed views. If SET NUMERIC_ROUNDABORT is ON, CREATE, UPDATE, INSERT, and DELETE statements on tables with indexes on computed columns or indexed views will fail. For more information about required SET option settings with indexed views and indexes on computed columns, see "Considerations When You Use the SET Statements" in SET Statements (Transact-SQL).

To view the current setting for this setting, run the following query.

DECLARE @NUMERIC_ROUNDABORT VARCHAR(3) = 'OFF';
IF ( (8192 & @@OPTIONS) = 8192 ) SET @NUMERIC_ROUNDABORT = 'ON';
SELECT @NUMERIC_ROUNDABORT AS NUMERIC_ROUNDABORT;

Requires membership in the public role.

The following example shows two values with a precision of four decimal places that are added and stored in a variable with a precision of two decimal places. The expressions demonstrate the effects of the different SET NUMERIC_ROUNDABORT and SET ARITHABORT settings.

-- SET NOCOUNT to ON, 
-- SET NUMERIC_ROUNDABORT to ON, and SET ARITHABORT to ON.
SET NOCOUNT ON;
PRINT 'SET NUMERIC_ROUNDABORT ON';
PRINT 'SET ARITHABORT ON';
SET NUMERIC_ROUNDABORT ON;
SET ARITHABORT ON;
GO
DECLARE @result DECIMAL(5, 2),
   @value_1 DECIMAL(5, 4), 
   @value_2 DECIMAL(5, 4);
SET @value_1 = 1.1234;
SET @value_2 = 1.1234 ;
SELECT @result = @value_1 + @value_2;
SELECT @result;
GO

-- SET NUMERIC_ROUNDABORT to ON and SET ARITHABORT to OFF.
PRINT 'SET NUMERIC_ROUNDABORT ON';
PRINT 'SET ARITHABORT OFF';
SET NUMERIC_ROUNDABORT ON;
SET ARITHABORT OFF;
GO
DECLARE @result DECIMAL(5, 2),
   @value_1 DECIMAL(5, 4), 
   @value_2 DECIMAL(5, 4);
SET @value_1 = 1.1234;
SET @value_2 = 1.1234 ;
SELECT @result = @value_1 + @value_2;
SELECT @result;
GO

-- SET NUMERIC_ROUNDABORT to OFF and SET ARITHABORT to ON.
PRINT 'SET NUMERIC_ROUNDABORT OFF';
PRINT 'SET ARITHABORT ON';
SET NUMERIC_ROUNDABORT OFF;
SET ARITHABORT ON;
GO
DECLARE @result DECIMAL(5, 2),
   @value_1 DECIMAL(5, 4), 
   @value_2 DECIMAL(5, 4);
SET @value_1 = 1.1234;
SET @value_2 = 1.1234 ;
SELECT @result = @value_1 + @value_2;
SELECT @result;
GO

-- SET NUMERIC_ROUNDABORT to OFF and SET ARITHABORT to OFF.
PRINT 'SET NUMERIC_ROUNDABORT OFF';
PRINT 'SET ARITHABORT OFF';
SET NUMERIC_ROUNDABORT OFF;
SET ARITHABORT OFF;
GO
DECLARE @result DECIMAL(5, 2),
   @value_1 DECIMAL(5, 4), 
   @value_2 DECIMAL(5, 4);
SET @value_1 = 1.1234;
SET @value_2 = 1.1234;
SELECT @result = @value_1 + @value_2;
SELECT @result;
GO
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