下面这条语句在t_hdmap_margin_rid_map中数据比较少的时候 in (...) 可以成功返回,但是数据大的时候直接返回false, 不管是in还是not in都返回false，请问有什么办法可以解决吗？
select new_rid from mid.t_hdmap_margin_rid_map as t_hdmap_margin_rid_map
where new_rid in (select new_rid from mid.t_hdmap_margin_rid_map as t_hdmap_margin_rid_map)我的数据库版本信息是 PostgreSQL 9.6.10 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-28), 64-bit
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可做如下优化
select new_rid from mid.t_hdmap_margin_rid_map as t_hdmap_margin_rid_map where new_rid = any(array (select new_rid from mid.t_hdmap_margin_rid_map as t_hdmap_margin_rid_map))详情参考 https://www.datadoghq.com/blog/100x-faster-postgres-performance-by-changing-1-line/
2019-07-17 23:09:24赞同 展开评论 打赏
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