# Formulas

Hey welcome back.

I know I said we would complete our first base in the last video but I really struggled to know exactly where I should put the section on formulas and the reason for that is that formulas yes are a field type but I mainly use them when I've been working with multiple tables.

So what I'm going to do here is just quickly introduce the formula field type in this section without going to in the weeds and then throughout the rest of the lesson or the rest of the sections we're going to be using formulas in various ways. And naturally we'll get a more deep understanding.

So formulas allow you to do an operation with multiple fields. So again let me just run through an example and I think it'll speak for itself. So what we want to do with this formula field type is add 30 percent to every candidate's salary and we'll call that an all in salary and that's a number we'll be able to pass to finance as the all encompassing cost of every single candidate. So I'm gonna call this all in salary it's going to be a formula field type and then it asks me for a formula. And if you're familiar with google sheets or Microsoft Excel, this is a very similar functionality. So at the top I have all my existing fields that I can use in the formula. And then the variety of functions that I can use. So we're not going to go into all of these obviously in this lesson but I will use the most important ones throughout the course.

To give you an example. So let's go ahead and use the expected salary and we're going to multiply that by one point three. So that gives us our all in salary which is simply our salary added by 30 percent. Now for those who views google sheets or Microsoft Excel I'm sure it feels weird not to select a range in the formula field type. So if I go back into the formula we don't say hey what range or what cells do you want to apply this function on. So adding by 30 percent we just say what field do you want to do. So this is one big difference I will highlight between Microsoft Excel and Airtable is that you have to work with the whole field. So that means you have to work in Google Sheet speak with the whole column. So you can't say hey just add 30 percent to these five cells and then add 50 percent to these ones. So  Airtable forces you to work with the whole column. And that's really one difference I wanted to highlight.

So again just a quick introduction into formulas which we'll use throughout the rest of the course in more depth.

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