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this morning we are going to talk about taking data out of an existing field this is often very useful and very important that we can analyze our data in detail now you need to obviously have attended the beginners course for this to make any sense most of this if not all of this will be familiar to most of you so it is a bit of revision which is good if you forgotten some of the things maybe theres one or two things that someone might pick up lets see how it goes so when we take data out of a field we use mainly functions and these are some of the functions we often use firstly we have the split function that we often use then we have the clean function and the substring function in fact those three functions are the only ones that we can use to take data out of an existing field those are the only three any other functions or tools we might use are purely there to help us along the way so for example we have the ED function f function does not take anything out of the field but it
