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Evaluating A Column Total



My application involves a judge entering scores for a list of products.  Each product has 4 characteristics that are scored (1-5) and are displayed in a table of results.


My problem is that I want to determine the minimum value for each of four separate columns and then be able to evaluate each minimum value in order to set the state of a button to active or inactive.  That is, if I can determine that the minimum value of any column equals zero, then I can disable/deactivate a "submit results" button. 


I can easily get the minimum value for each column using an aggregate, but can't seem to find any way to evaluate the value of an aggreate.


Any ideas on how I create a column total that I can then evaluate or test, in order to trigger a button state?



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