>Hi,
>
>I am testing the following Alter command (in SSMS)
>

>alter TableName Alter ColumnName numeric (12,2) not null
>

>The result I get is what I want: the column size changes, it is not null, and The Default is set to 0 (which I did not specify above).
>Is Default set to 0 (zero) by design because my expressing says Not Null?
>
>TIA

If you have set DEFAULT before altering the column usually must drop the constraint, alter column and then put the constraint back.
I got to many errors from different versions of SQL Server when I tried to alter columns so I choose this approach.
Maybe different versions handle this differently but I don't risk anymore.