[英]Oracle Query Help - Sub-query for grouping
我有带有以下列和数据条目的表(示例)
EID ROW_NUM ROW_VALUE
SM 1 E
SM 2 E
PM 2 E
SM 3 E
AM 3 S
PM 3 E
SM 4 E
AM 4 S
SM 5 S
AM 5 E
PM 5 E
SM 6 S
AM 6 E
PM 6 E
NM 6 S
我必须按row_num分组并删除以下组合上匹配的记录(精确)
我正在寻找如何制定一个查询,可以删除或至少返回back_num这样的组合?
如果需要,我可以添加更多信息
我相信应该这样做:
select distinct row_num
from example_table t1
where
not (
exits ( select 1
from example_table t2
where t2.row_num=t1.row_num and t2.eid='SM' and t2.row_value='E')
and
exits ( select 1
from example_table t3
where t3.row_num=t1.row_num and t3.eid='PM' and t3.row_value='E')
)
and
not (
exits ( select 1
from example_table t4
where t4.row_num=t1.row_num and t4.eid='SM' and t4.row_value='S')
and
exits ( select 1
from example_table t5
where t5.row_num=t1.row_num and t5.eid='AM' and t5.row_value='E')
and
exits ( select 1
from example_table t6
where t6.row_num=t1.row_num and t6.eid='PM' and t6.row_value='E')
);
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