Question

我如何加入以下表格以提供所有表格的总计数。

select (BatchIdentifier),
       Count(distinct BatchIdentifier) as ERTBatchCheckIdentifier
from ERTBatchChecks 
Group By BatchIdentifier

select (ERTBatchNumber),
       Count(distinct ERTBatchNumber) as ERTBatchNumber
from ERTClaims
Group By ERTBatchNumber

select (BatchIdentifier),
       Count(distinct BatchIdentifier) as ERTBatchesIdentifier
from ERTBatches
Group By BatchIdentifier

Answer 1

如果您只想要一个SUM()，那么请使用派生表和union all：

SELECT Batch, SUM(Cnt) AS TotalCount
FROM (

    select (BatchIdentifier) AS Batch,
           Count(distinct BatchIdentifier) as Cnt
    from ERTBatchChecks 
    Group By BatchIdentifier

    union all

    select (ERTBatchNumber),
           Count(distinct ERTBatchNumber)
    from ERTClaims
    Group By ERTBatchNumber

    union all

    select (BatchIdentifier),
           Count(distinct BatchIdentifier)
    from ERTBatches
    Group By BatchIdentifier

   ) SubCounts
GROUP BY Batch

如果您想要不同'批次'的总数，请使用union和COUNT()：

SELECT Count(Batch) AS TotalDistinctBatches
FROM (

    select distinct BatchIdentifier as Batch
    from ERTBatchChecks

    union

    select distinct ERTBatchNumber
    from ERTClaims

    union

    select distinct BatchIdentifier
    from ERTBatches

   ) DistinctBatches

注意：Union all会保留重复项，Union则不会。因此，为了添加计数，我们希望在两个计数相同的情况下使用Union all。但是，为了计算不同的批次，我们需要Union，因此我们不会多次计算同一批次。

加入表格和总数

1 个答案: