EXPLAIN: rows

oscon=>  explain select oid from pg_proc;
                        QUERY PLAN                         
-----------------------------------------------------------
 Seq Scan on pg_proc  (cost=0.00..72.92 rows=1492 width=4)

• Shows the estimated number of rows that this operator will produce
   
• Estimate only - varies greatly. Mildly important
   
• 10% rule for some operators

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