oracle查询return重复数据

Question

我写了一个 oracle 查询来获取数据，它是 return 重复数据，所以我使用 distinct keyword.But 我得到一个错误：- ORA-01791: 不是 SELECTed 表达式

Oracle 查询：-

  Select Distinct  pi.first_name || ' ' || pi.last_name initiator
                 , pi.user_id
                 , c.country_name
                 , e.eform_name
                 , w.date_stamp_utc
                 , decode (
                           waRating.attr_value, 4, 'Very Positive',
                                                3, 'Positive',
                                                2, 'Neutral',
                                                1, 'Negative',
                                                0, 'Very Negative', '???'
                          ) rating
                , waEnv.attr_value environment
                , nvl(ua.agent_name, '???') browser
                , nvl(ua.agent_version, '???') version
                , waFeedback.attr_value negative_feedback

            From request_workflow w 
      Inner Join request_workflow_attribute waRating
              On waRating.request_workflow_id = w.row_id
             And waRating.attr_name = 'UserRating'
      Inner Join request_workflow_attribute waEnv
              On waEnv.request_workflow_id = w.row_id
             And waEnv.attr_name = 'Environment'
      Inner Join request_workflow_attribute waBrowser
              On waBrowser.request_workflow_id = w.row_id
             And waBrowser.attr_name = 'UserAgent'
       Left Join request_workflow_attribute waFeedback
              On waFeedback.request_workflow_id = w.row_id
             And waFeedback.attr_name = 'UserFeedback'
      Inner Join person_info pi
              On w.performer_id = pi.row_id
      Inner Join request_common rc
              On w.request_id = rc.row_id
      Inner Join eform e
              On rc.eform_id = e.row_id
       Left Join user_agent ua
              On waBrowser.attr_value = ua.user_agent_raw
      Inner Join country c
              On pi.country_code = c.country_code

           Where w.date_stamp_utc 
         Between '1-dec-2014' And '31-dec-2015'
        Order By waRating.attr_value desc, eform_name;

请建议如何让它发挥作用。

Answer 1

使用group by代替select distinct:

select . . .
from . . .
where . . .
group by pi.first_name || ' ' || pi.last_name initiator
     , pi.user_id
     , c.country_name
     , e.eform_name
     , w.date_stamp_utc
     , decode(waRating.attr_value, 4, 'Very Positive',
                                   3, 'Positive',
                                   2, 'Neutral',
                                   1, 'Negative',
                                   0, 'Very Negative', '???')
     , waEnv.attr_value
     , nvl(ua.agent_name, '???')
     , nvl(ua.agent_version, '???')
     , waFeedback.attr_value 
order by waEnv.attr_value, eform_name;

Answer 2

错误信息是由您的order by 子句中的字段引起的。是

order by waRating.attr_value desc, eform_name

在您的 select 子句中，您有：

waEnv.attr_value environment

虽然字段名称相同，但它们来自不同的表。但是，这可能并不重要，因为您还在 select 子句中使用了别名。在您的 order by 子句中使用相同的子句：

order by environment desc, eform_name

oracle查询return重复数据

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