Oracle三层嵌套查询的bug

如下的SQL语句查询不到任何记录，尽管数据库中有符合条件的记录。这是Oracle三层查询的bug。select cb.* from mw_app.t_cb cb where cb.obj_id in （select cba.channel_id from mw_app.t_current_business_alarm cba where cba.business_id in （select b.business_id from mw_app.t_rt_business b where b.alarm_state <> "0" and b.business_code = "1"））要想查询到结果，就需要更改sql语句，可以改成select cb.* from mw_app.t_cb cb Left Join （select alarm.channel_id from mw_app.t_current_business_alarm alarmwhere alarm.business_id in （ select business_id from mw_app.t_rt_business where alarm_state <> "0" and business_code = "1" ）） b On cb.obj_id=b.channel_id或者select cb.* from mw_app.t_cb cb Left Join （select alarm.channel_id from mw_app.t_current_business_alarm alarm left join mw_app.t_rt_business biz on alarm.business_id = biz.business_idwhere （biz.alarm_state <> "0" and biz.business_code = "1"）） b On cb.obj_id=b.channel_idOracle中交集 INTERSECT 的使用Oracle如何实现跨库查询相关资讯 Oracle基础教程

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