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I’m sure many of you have built a spreadsheet like this before: you’ve got a table of data; one of the columns in this table contains a formula which references a span of columns in the same table. The number of columns you need to reference may change over time as requirements change. How do you you build this table in such a way that the number of columns can be changed without breaking the formula that references them?Let’s walk through a somewhat contrived but simple example to demonstrate the issue. Say I’m a real estate investor and I’m tracking a list of houses I’m interested in purchasing. I’m a demanding and detail oriented buyer so I want to know the square footage of the individual rooms in the dwelling. Based on this information,Windows 7 Pro Product Key, I want to calculate the count of rooms in the dwelling as well as the total square feet of the rooms combined. The table might look something like this: The formula for the “#Rooms” column looks something like this:=COUNT( Table1[[#This Row],[SqFt-Room1]:[SqFt-Room3]] )Now, let’s say I want to add a new house, but this new house has four rooms. Simple,Office 2010 Professional Plus Key, just add a column,Office Pro 2010 Key, right? Not so fast; depending on how we add that column our formulas for “#Rooms” and “Ttl Sq. ft.” may not update as expected.Or let’s say I’ve changed focus to small condominiums and no longer have a need for the “Room3” column. If I attempt to delete it, then my formulas will break. How do we avoid this?Here's one trick I use in such situations. It may not be the best answer,Office 2007 Ultimate Key, but I’ll share it with you here and if others have suggestions to offer you can add them to the comments.Solution: add an extra “dummy” column before and after the span as end caps, and refer to those columns in your formulas. Using our real estate example, I would add a column before “SqFt-Room1” called “RoomsStart” and one after “SqFt-Room3” called “RoomsEnd”, like so: I would keep these columns empty and never put data in them. This is important because otherwise my COUNT and SUM formulas may return the wrong results. Then I’d highlight the columns a different shade (this is totally optional but I personally like the visual effect of marking off the start and end of the span) and resize them to something very small so they are out of the way for the most part, like so: Alternatively, you can hide the columns if you so desire. Then I’d update my formulas so that they referenced these columns instead, like so: Now,Office Professional Plus 2007 Key, when I want to add a fourth room, I select the “RoomsEnd” column and right-click \ Insert and I get a new column which I can name “SqFt-Room4”. This new column will automatically be included in my COUNT and SUM calculations. Similarly, if I ever get rid of “SqFt-Room4”, I don’t have to worry about breaking any of my formulas. It may not be the most elegant solution, but it gives me a virtually worry-free way to reference a changing number of columns in my table. <div

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