Try this

SELECT CONVERT(DECIMAL(10,2),YOURCOLUMN)

such as

SELECT CONVERT(DECIMAL(10,2),2.999999)

will result in output 3.00

Use Str() Function. It takes three arguments(the number, the number total characters to display, and the number of decimal places to display

  Select Str(12345.6789, 12, 3)

displays: ' 12345.679' ( 3 spaces, 5 digits 12345, a decimal point, and three decimal digits (679). - it rounds if it has to truncate, (unless the integer part is too large for the total size, in which case asterisks are displayed instead.)

for a Total of 12 characters, with 3 to the right of decimal point.

Generally you can define the precision of a number in SQL by defining it with parameters. For most cases this will be NUMERIC(10,2) or Decimal(10,2) - will define a column as a Number with 10 total digits with a precision of 2 (decimal places).

Edited for clarity

This is how the kids are doing it today:

DECLARE @test DECIMAL(18,6) = 123.456789
SELECT FORMAT(@test, '##.##')

123.46

This work for me and always keeps two digits fractions

23.1 ==> 23.10

25.569 ==> 25.56

1 ==> 1.00

Cast(CONVERT(DECIMAL(10,2),Value1) as nvarchar) AS Value2

Code screenshot

If you only need two decimal places, simplest way is..

SELECT CAST(12 AS DECIMAL(16,2))

OR

SELECT CAST('12' AS DECIMAL(16,2))

Output

12.00

If you're fine with rounding the number instead of truncating it, then it's just:

ROUND(column_name,decimals)

Try this:

 declare @MyFloatVal float;

    set @MyFloatVal=(select convert(decimal(10, 2), 10.254000))

    select  @MyFloatVal

    Convert(decimal(18,2),r.AdditionAmount) as AdditionAmount

Multiply the value you want to insert (ex. 2.99) by 100

Then insert the division by 100 of the result adding .01 to the end:

299.01/100

This will allow total 10 digits with 2 values after the decimal. It means that it can accomodate the value value before decimal upto 8 digits and 2 after decimal.

To validate, put the value in the following query.

DECLARE vtest  number(10,2);
BEGIN
SELECT 10.008 INTO vtest FROM dual;
dbms_output.put_line(vtest);
END;