Thank you for the reply. Most of the values are not number, they are varchar and text. Such as comment and adress. Could ‘by’ be used to compare text value change ? And each table has 30 to 50 columns to be checked if there are difference between 1 month old snapshot, 2 months old one, 3 months old one. So I can only compare two copies at a time with ‘by’ function, is it true?I wonder if It is something rather simple?
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