oracle内部联接上的标识符无效

Question

我有错误ORACLE:ORA-00904:无效的标识符:

and l.cd_pergunta = e.cd_pergunta

无效标识符是'e',cd_pergunta的前缀...

当我执行此查询时:

select count(*)
  from TEACEITE e
 inner join TEREGETA re on re.cd_etapa = e.cd_etapa
                       and re.id_reg_neg = 1.00000000
 where e.obrigatorio = 1
   and not exists
 (select 1
          from GESESSAO s
         inner join GERESPOS r on r.sessao = s.sessao_resp
                              and r.resposta_log = 1
         inner join GEEPE l on l.cd_quest = s.cd_quest
                           and l.ord_perg = r.ord_pergunta
                           and l.cd_pergunta = e.cd_pergunta
         where s.cd_quest = e.cd_quest
           and s.item = e.cd_etapa
           and s.origem = 'GC'
           and s.os_nf_orc_cont = 1.00000000)

任何的想法？

Answer 1

问题是别名e在嵌套选择中不可用,因此"无效标识符".您可以尝试重写查询,以便条件s.cd_quest = e.cd_quest and s.item = e.cd_etapa是主选择的一部分而不是嵌套选择.

编辑:我尝试了几个场景,问题是在嵌套查询中的连接解析期间别名e不可用.看起来你不能在内部查询的连接条件中引用外部表别名.

我相信以下内容会奏效

  select count(*)
  from TEACEITE e
 inner join TEREGETA re on re.cd_etapa = e.cd_etapa
                       and re.id_reg_neg = 1.00000000
 where e.obrigatorio = 1
   and not exists
 (select 1
          from GESESSAO s
         inner join GERESPOS r on r.sessao = s.sessao_resp
                              and r.resposta_log = 1
         inner join GEEPE l on l.cd_quest = s.cd_quest
                           and l.ord_perg = r.ord_pergunta
         where l.cd_pergunta = e.cd_pergunta
           and s.cd_quest = e.cd_quest
           and s.item = e.cd_etapa
           and s.origem = 'GC'
           and s.os_nf_orc_cont = 1.00000000)

虽然这个查询可能有效,但我不确定它是否能完成你想要的,请确保你的业务逻辑也得到了解决.