T-SQL set trailing numbers to zeros

Question

I'm working on a stored procedure on SQL Server 2014.

I have a variable:

DECLARE @VersionNumber DECIMAL(18,1);

This VersionNumber can have values such as 1.0 or 1.4.

In my logic, I increase the number +0.1 if there is a minor change and +1 if there is a major change .

If there is a major change though, I want to reset the trailing numbers to 0.

Example: Version 1.4 should become 2.0 after a major change

My current query looks like this:

IF @IsMajor = 'true'
BEGIN
    SELECT @VersionNumber = COALESCE(1 + MAX([VersionNumber]), 1)
    FROM [MySchema].[Project]
END
IF @IsMajor = 'false'
BEGIN
    SELECT @VersionNumber = COALESCE(0.1 + MAX([VersionNumber]), 1)
    FROM [MySchema].[Project]
END

Do you know how to reset the trailing number to 0 on a decimal number?

Thank you!

Answer 1

Use FLOOR

IF @IsMajor = 'true'
BEGIN
    SELECT @VersionNumber = FLOOR(COALESCE(1 + MAX([VersionNumber]), 1))
    FROM [MySchema].[Project]
END
IF @IsMajor = 'false'
BEGIN
    SELECT @VersionNumber = COALESCE(0.1 + MAX([VersionNumber]), 1)
    FROM [MySchema].[Project]
END

Answer 2

You can first cast MAX(VersionNumber) to an int . This will cut off the decimal digits. If you convert it back to a decimal(18,1) you can add 1:

SELECT COALESCE(1 + CONVERT(DECIMAL(18, 1), CONVERT(INT, MAX([VersionNumber]))), 1)

Answer 3

or ceiling

IF @IsMajor = 'true'
BEGIN
    SELECT @VersionNumber = ceiling(MAX([VersionNumber])+.1)
    FROM [MySchema].[Project]