Normalising data has several diffrent meanings statistically speaking. I am guessing given the mention of the Y column, you wish to scale your data between 0 and 1.
There are several diffrent methods to do this;
- Divide the entire column by the largest elemental value in the column provided this data is from 0-X.
Let me know if this is what you are looking for or a diffrent satisitcal meaning or normilisation.