Doubt regarding query and subquery

Hi guys,
if I run the following query :
SELECT NUM_OCORRENCIA, NUM_ENVOLVIDO FROM BO_VEIC_ACIDENTE BVA
WHERE BVA.NUM_OCORRENCIA = BE.NUM_OCORRENCIA
I get the following error message : ORA-00904: "BE"."NUM_OCORRENCIA": invalid identifier
because we dropped the column num_ocorrencia.
But if I run the same query as a subquery , like :
SELECT COUNT(BE.NUM_ENVOLVIDO)
FROM BO_ENVOLVIDO BE ,
BO_TIPO_ENVOLVIMENTO BTE
WHERE BE.ID_ENVOLVIMENTO = BTE.ID_TIPO_ENVOLVIMENTO
AND BTE.CODIGO IN ('0100','0200','0300','1302','1303','1304')
AND (BE.NUM_OCORRENCIA,BE.NUM_ENVOLVIDO) NOT IN (SELECT NUM_OCORRENCIA, NUM_ENVOLVIDO
FROM BO_VEICULO_ENVOLVIDO BVE
WHERE BVE.NUM_OCORRENCIA = BE.NUM_OCORRENCIA)
AND (BE.NUM_OCORRENCIA,BE.NUM_ENVOLVIDO) NOT IN (SELECT NUM_OCORRENCIA, NUM_ENVOLVIDO
FROM BO_VEIC_ACIDENTE BVA
WHERE BVA.NUM_OCORRENCIA = BE.NUM_OCORRENCIA)
AND BE.NUM_OCORRENCIA IN (SELECT NUM_OCORRENCIA FROM BO_OCORRENCIA_POLICIAL WHERE COD_TIPO_OCORRENCIA = 1)
AND BE.NUM_OCORRENCIA = '2006-000000406' ;
no error message are displayed. So I want to understand why Oracle get this behavior in this query.in the last query i got the result ' 0 ' . why Oracle didn´t showed me the same error in the second option ?
thanks,
Felipe

I think you need to get some coffee ;)
It's a scope issue the table alias BE does not exist in the first query but does in the second so it can be referenced in the subqubquery.
Hi guys,
if I run the following query :
SELECT NUM_OCORRENCIA, NUM_ENVOLVIDO FROM
BO_VEIC_ACIDENTE BVA
WHERE BVA.NUM_OCORRENCIA = BE.NUM_OCORRENCIA
I get the following error message : ORA-00904:
"BE"."NUM_OCORRENCIA": invalid identifier
because we dropped the column num_ocorrencia.
But if I run the same query as a subquery , like :
SELECT COUNT(BE.NUM_ENVOLVIDO)
FROM BO_ENVOLVIDO BE ,
BO_TIPO_ENVOLVIMENTO BTE
E BE.ID_ENVOLVIMENTO = BTE.ID_TIPO_ENVOLVIMENTO
AND BTE.CODIGO IN
('0100','0200','0300','1302','1303','1304')
AND (BE.NUM_OCORRENCIA,BE.NUM_ENVOLVIDO) NOT IN
(SELECT NUM_OCORRENCIA, NUM_ENVOLVIDO
FROM
BO_VEICULO_ENVOLVIDO BVE
WHERE
BVE.NUM_OCORRENCIA = BE.NUM_OCORRENCIA)
AND (BE.NUM_OCORRENCIA,BE.NUM_ENVOLVIDO) NOT IN
(SELECT NUM_OCORRENCIA, NUM_ENVOLVIDO
ROM BO_VEIC_ACIDENTE BVA
WHERE
BVA.NUM_OCORRENCIA = BE.NUM_OCORRENCIA)
AND BE.NUM_OCORRENCIA IN (SELECT NUM_OCORRENCIA FROM
BO_OCORRENCIA_POLICIAL WHERE COD_TIPO_OCORRENCIA =
1)
AND BE.NUM_OCORRENCIA = '2006-000000406' ;
no error message are displayed. So I want to
understand why Oracle get this behavior in this
query.in the last query i got the result ' 0 ' . why
Oracle didn´t showed me the same error in the second
option ?
thanks,
Felipe

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Handle:     sunitha2010
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from ems_exception
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