I have 4 columns that I am trying to get the greatest value for.
I am using the following query:
UPDATE TestTable SET TestTable.[Last PQC Month] = IIf([PQC1] Is Null," ",IIf([PQC1]>=[PQC2],[PQC1],IIf([PQC2]>=[PQC3],[PQC2],IIf([PQC3]>=[PQC4],[PQC3],[PQC4]))));
However, the query only updates...