Actually, all my question is written in subj-field. It's it somehow possible in PostgreSQL? Probably at server-config level, or can be configured in query, or in properties of table? I hardly tried to google for it, but got no result. So your help would be very appreciated (even pointing me to google with correct query, if i'm mistaken. Thanks beforehand.
PostgreSQL: How to force db use the "quicksort" sorting method instead of "top-N heapsort"?
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You cannot. The planner will pick the more appropriate method based on what you're doing: