Truncate (not round) decimal places in SQL Server

ROUND ( 123.456 , 2 , 1 )

When the third parameter != 0 it truncates rather than rounds.

Syntax

ROUND ( numeric_expression , length [ ,function ] )

Arguments

• numeric_expression Is an expression of the exact numeric or approximate numeric data type category, except for the bit data type.

• length Is the precision to which numeric_expression is to be rounded. length must be an expression of type tinyint, smallint, or int. When length is a positive number, numeric_expression is rounded to the number of decimal positions specified by length. When length is a negative number, numeric_expression is rounded on the left side of the decimal point, as specified by length.

• function Is the type of operation to perform. function must be tinyint, smallint, or int. When function is omitted or has a value of 0 (default), numeric_expression is rounded. When a value other than 0 is specified, numeric_expression is truncated.

select round(123.456, 2, 1)

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

Here's the way I was able to truncate and not round:

select 100.0019-(100.0019%.001)

returns 100.0010

And your example:

select 123.456-(123.456%.001)

returns 123.450

Now if you want to get rid of the ending zero, simply cast it:

select cast((123.456-(123.456%.001)) as decimal (18,2))

returns 123.45

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)

Another truncate with no rounding solution and example.

    Convert 71.950005666 to a single decimal place number (71.9)
    1) 71.950005666 * 10.0 = 719.50005666
    2) Floor(719.50005666) = 719.0
    3) 719.0 / 10.0 = 71.9

    select Floor(71.950005666 * 10.0) / 10.0

ROUND(number, decimals, operation)

number => Required. The number to be rounded
decimals => Required. The number of decimal places to round number to
operation => Optional. If 0, it rounds the result to the number of decimal. If another value than 0, it truncates the result to the number of decimals. Default value is 0

SELECT ROUND(235.415, 2, 1)

will give you 235.410

SELECT ROUND(235.415, 0, 1)

will give you 235.000

But now trimming0 you can use cast

SELECT CAST(ROUND(235.415, 0, 1) AS INT)

will give you 235

This will remove the decimal part of any number

SELECT ROUND(@val,0,1)

SELECT CAST(Value as Decimal(10,2)) FROM TABLE_NAME;

Would give you 2 values after the decimal point. (MS SQL SERVER)

Try like this:

SELECT cast(round(123.456,2,1) as decimal(18,2)) 

If you desire to take some number like 89.0904987 and turn it into 89.09 by simply omitting the undesired decimal places, simply use the following:

select cast(yourColumnName as decimal(18,2))

The following screenshot is from W3Schools SQL Data Types section, which describes what decimal(18,2) is doing:

Therefore,

select cast(89.0904987 as decimal(18,2))

gives you: 89.09

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

I think we can go much easier with simpler example solution found in Hackerrank:

Problem statement: Query the greatest value of the Northern Latitudes (LAT_N) from STATION that is less than 137.2345. Truncate your answer to 4 decimal places.

SELECT TRUNCATE(MAX(LAT_N),4)
FROM STATION
WHERE LAT_N < 137.23453;

Solution Above gives you idea how to simply make value limited to 4 decimal points. If you want to lower or upper the numbers after decimal, just change 4 to whatever you want.

select convert(int,@value)