What query or queries would you use to find all repeat customers, change their shipping costs to zero, and then three months from now track their purchases to see if they purchased more over the last three months than the three months before the shipping costs were changed?
A) Find duplicates, then crosstab B) Find duplicates, then update, then crosstab
C) Update, then crosstab D) Update, then find duplicates, then crosstab
B
Computer Science & Information Technology
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