Longer-form writing from the BrevFeed team.
Same Result, 100x Slower: The SQL Anti-Join at 500 Million Rows
'Find the pages with no likes' is a five-minute interview question. At 500M rows on PostgreSQL, five equivalent-looking queries ranged from 3m 44s to over 6 hours. Here's why.
Jul 04, 2026
sqlpostgresqlperformancedatabases