PostgreSQL join where 条件不同 explain 执行计划的差别

发布时间：2020-12-13 17:14:26 所属栏目：百科来源：网络整理

导读：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 on a.order_id = b.order_id where a.order_id = 'o

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 on a.order_id = b.order_id where a.order_id = 'oid1' --b.order_id = 'oid1'

待研究 Nested Loop Left Join,Nested Loop,Hash Left Join

（编辑：李大同）

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