Pasar valor a la mesa derivada
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12-12-2019 - |
Pregunta
¿Hay una manera de aprobar un valor a una consulta de tabla derivada?
En la tabla derivada, quiero hacer referencia a un valor ([docSVsys].[sID])
de la consulta externa.
Recibo un error:
msg 4104, nivel 16, estado 1, línea 7 El identificador multifunción "docsvsys.sid" no se pudo limitar.
Sí, sé que esta consulta se puede simplificar en ningún bucle.
Tener un cursor que tenga que hacer un bucle y intentar convertirlo, así que configure.select top 10 [docSVsys].[sID], [sI].[count] from docSVsys join ( select count(*) as [count] from docSVenum1 as [sIt] where [sIt].[sID] = [docSVsys].[sID] ) as [sI] on '1' = '1' order by [docSVsys].[sID]
cross aplique parecía hacer el truco. Y es exactamente 1/3 más rápido que la versión del cursor. Consulta real usando Cross Aplicar a continuación.
SELECT [sO].[sID], [sI].[max], [sI].[avg], [sI].[stdev] FROM docSVsys as [sO] with (nolock) cross apply ( select [sO].[sID], max(list.match) as 'max', avg(list.match) as 'avg', stdev(list.match) as 'stdev' from ( select #SampleSet.[sID], [match] = 200 * count(*) / CAST ( #SampleSetSummary.[count] + [sO].[textUniqueWordCount] as numeric(8,0) ) from #SampleSet with (nolock) join FTSindexWordOnce as [match] with (nolock) -- this is current @sID on match.wordID = #SampleSet.wordID and [match].[sID] = [sO].[sID] join #SampleSetSummary with (nolock) -- to get the word count from the sample set on #SampleSetSummary.[sID] = #SampleSet.[sID] group by #SampleSet.[sID], #SampleSetSummary.[count] ) as list having max(list.match) > 60 ) as [sI] where [textUniqueWordCount] is not null and [textUniqueWordCount] > 4 and [sO].[sID] <= 10686 order by [sO].[sID]
Solución
Puede hacer lo que desea con una cruz aplique en lugar de unirse:
select top 10 [docSVsys].[sID], [sI].[count]
from docSVsys
cross apply
(
select count(*) as [count]
from docSVenum1 as [sIt]
where [sIt].[sID] = [docSVsys].[sID]
) as [sI]
order by [docSVsys].[sID]
Otros consejos
Agregue el ID a la tabla derivada y únase en que:
select top 10 [docSVsys].[sID], [sI].[count]
from docSVsys
join
(
select [sIt].[sID], count(*) as [count]
from docSVenum1 as [sIt]
group by [sIt].[sID]
) as [sI]
on [sI].[sID] = [docSVsys].[sID]
order by [docSVsys].[sID]