😀 I'm using SQLyog version 3.11 – when I create a new table and select 'decimal' as a data type for a field it will not let me select 'unsigned' for this field. The 'unsigned attribute is disabled.
According to the MySql documentation you should be able to make a decimal field unsigned – doing so will prevent negative numbers from being assigned to the field.
My workaround…I was forced to use MySql CC (ugh!) to correct the problem.