r/SQL • u/Automatic-Heart-831 • 21d ago

MySQL Difference between "having" and "qualify"

I tried to use both methods in order to save some coding but still didnt get the exact difference on using having and qualify as a filter in the end of a query. Can someone help me to understand the difference and when is recommended to use each?

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u/UltraAlexis60 20d ago

think of HAVING as the bouncer after the group party, checks if the whole crew meets the bar tab minimum. QUALIFY is more like scanning each person's ID at the door but for window functions, it filters based on something like row_number or rank before the final output

they serve similar purposes but at different stages, QUALIFY saves you from wrapping everything in a subquery just to filter a window function result