例如,从the EXPLAIN documentation开始:
EXPLAIN SELECT * FROM tenk1; QUERY PLAN ------------------------------------------------------------- Seq Scan on tenk1 (cost=0.00..458.00 rows=10000 width=244)
width=244
是什么意思?
例如,从the EXPLAIN documentation开始:
EXPLAIN SELECT * FROM tenk1; QUERY PLAN ------------------------------------------------------------- Seq Scan on tenk1 (cost=0.00..458.00 rows=10000 width=244)
width=244
是什么意思?