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Just to be clear, using your sample data, all the values in the campaign column will be "No" since since all vendors have at least one "No". Is this correct? If not, please provide the output that you require and any specific rules.
Sorry for the confusion. The actual data set I am using has thousands of rows with some Vendors that will be all yes and some will be all no. There are hundreds of vendors that have a combination of yes and no and those need to be changed to all no while not changing the other vendors that have all yes and all no.