Truncate (not round) decimal places in SQL Server

Question

I'm trying to determine the best way to truncate or drop extra decimal places in SQL without rounding. For example:

declare @value decimal(18,2)

set @value = 123.456

This will auto round @Value to be 123.46....which in most cases is good. However, for this project I don't need that. Is there a simple way to truncate the decimals I don't need? I know I can use the left() function and convert back to a decimal...any other ways?

Answer 1

I know this question is really old but nobody used sub-strings to round. This as advantage the ability to round really long numbers (limit of your string in SQL server which is usually 8000 characters):

SUBSTRING('123.456', 1, CHARINDEX('.', '123.456') + 2)

Answer 2

SELECT Cast(Round(123.456,2,1) as decimal(18,2))

Answer 3

Another way is ODBC TRUNCATE function:

DECLARE @value DECIMAL(18,3) =123.456;

SELECT @value AS val, {fn TRUNCATE(@value, 2)} AS result

LiveDemo

Output:

╔═════════╦═════════╗
║   val   ║ result  ║
╠═════════╬═════════╣
║ 123,456 ║ 123,450 ║
╚═════════╩═════════╝

Remark:

I recommend using built-in ROUND function with 3rd parameter set to 1.

Answer 4

Do you want the decimal or not?

If not, use

select ceiling(@value),floor(@value)

If you do it with 0 then do a round:

select round(@value,2)

Answer 5

select convert(int,@value)

Answer 6

Please try to use this code for converting 3 decimal values after a point into 2 decimal places:

declare @val decimal (8, 2)
select @val = 123.456
select @val =  @val

select @val

The output is 123.46