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Hi all, I want to find out how PG gets rows when it explains a
query. For example, when I issue: explain select count(*) from pg_class where
relname='pg_class'; QUERY PLAN -------------------------------------------------------------- Aggregate (cost=4.55..4.55 rows=1 width=0) -> Seq Scan on pg_class (cost=0.00..4.55 rows=1
width=0) Filter: (relname = 'pg_class'::name) (3 rows) Where and how PG get “rows=1”? Thank you! |
