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IIF Function Within A Query

IIF Function Within A Query
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I only have some experience of IIF statements so please bare with me. I am trying to get the value of three fields into One field. The Problem I have is, there are three fields that are either Yes Or No Fields. For Example here are the only possible outcomes from any record displayed within a query with the three field values.
....

I would like to create a new field Called "Work Due" that will be able to pick up the Field data "Yes" from either of the three different Fields(1,2 & 3) from any record within the records returned by the query, so that when I
put the query into a form in datasheet view the form will only show 1 field header ("Work Due") instead of 3 with the data from the field type where the data equals "YES"
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