A manager for a hospital billing system wants to display the last four digits of a credit card number when printing invoices.Which credit card security action does this?
I feel pretty confident about this one. I remember the rule is that you can use single-row functions in the WHERE clause without a subquery, but you do need a subquery if you want to use them in the HAVING clause. For aggregate functions, it's the opposite - you need a subquery in the WHERE clause but not in the HAVING clause.
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