PostgreSQL join where 条件不一样 explain 执行计划的差异

编辑中web explain analyze select a.order_id, a.customer_id, a.price, b.order_id, b.customer_id, b.customer_name from tbl_a a left join tbl_b b --(select t.order_id from tbl_b t where t.order_id= 'oid1')b

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