如何将数据从一列插入另一个sql server

I'm having trouble inserting data from one column to another within the same table. I have no problem inserting individual rows but that is not what I want. I have a column called "PercentFull", I am multiplying this value by .01 to get the decimal equivalent, which is what I want to be inserted into a column I've called "NewPercentFull". I have tried the following:I'm having trouble inserting data from one colu