需要将子查询中使用聚合函数的 Oracle SQL 转换为 SQL Server (T-SQL) 查询

Question

Oracle 查询是

SELECT A.BUSINESS_UNIT 
     , A.EXT_ORG_ID 
     , A.INVOICE_ID 
     , A.CONTACT_NAME 
     , SUM(A.LINE_AMT) AS INVOICE_AMT 
     , SUM(CASE WHEN A.APPLIED_AMT - Nvl(( SELECT SUM(LINE_AMT) FROM PS_ITEM_LINE_SF WHERE BUSINESS_UNIT = A.BUSINESS_UNIT AND COMMON_ID = A.EXT_ORG_ID AND ITEM_NBR = A.ITEM_NBR AND ITEM_TYPE_CD = A.ITEM_TYPE_CD 
                                           AND LINE_AMT*100000+LINE_SEQ_NBR>A.LINE_AMT*100000+A.LINE_SEQ_NBR),0) < 0 THEN A.LINE_AMT
                WHEN A.APPLIED_AMT - Nvl(( SELECT SUM(LINE_AMT) FROM PS_ITEM_LINE_SF WHERE BUSINESS_UNIT = A.BUSINESS_UNIT AND COMMON_ID = A.EXT_ORG_ID AND ITEM_NBR = A.ITEM_NBR AND ITEM_TYPE_CD = A.ITEM_TYPE_CD 
                                           AND LINE_AMT*100000+LINE_SEQ_NBR>A.LINE_AMT*100000+A.LINE_SEQ_NBR),0) >= A.LINE_AMT THEN 0 
                ELSE A.LINE_AMT - A.APPLIED_AMT+Nvl(( SELECT SUM(LINE_AMT) FROM PS_ITEM_LINE_SF WHERE BUSINESS_UNIT = A.BUSINESS_UNIT AND COMMON_ID = A.EXT_ORG_ID AND ITEM_NBR = A.ITEM_NBR AND ITEM_TYPE_CD =
                                                      A.ITEM_TYPE_CD AND LINE_AMT*100000+LINE_SEQ_NBR>A.LINE_AMT*100000+A.LINE_SEQ_NBR),0) END) AS INVOICE_BALANCE 
      , 0.0 FROM PS_SIS_SF_EO_INV_V A 
      GROUP BY A.BUSINESS_UNIT, A.EXT_ORG_ID, A.INVOICE_ID, A.CONTACT_NAME

将 NVL 转换为 ISNULL 时出现以下错误。 "Cannot perform an aggregate function on an expression containing an aggregate or a subquery."于是在网上查了一下，发现必须应用CTE。

我按如下方式转换查询，但查询结果仍然与 Oracle 查询不同。请帮忙。

WITH CTELINE AS (SELECT SUM(B.LINE_AMT) AS LINE_AMT, A.BUSINESS_UNIT FROM PS_ITEM_LINE_SF B, PS_SIS_SF_EO_INV_V A
                 WHERE B.BUSINESS_UNIT = A.BUSINESS_UNIT    AND B.COMMON_ID = A.EXT_ORG_ID AND B.ITEM_NBR = A.ITEM_NBR    AND B.ITEM_TYPE_CD = A.ITEM_TYPE_CD    
                 AND B.LINE_AMT*100000 + B.LINE_SEQ_NBR > A.LINE_AMT * 100000 + A.LINE_SEQ_NBR GROUP BY A.BUSINESS_UNIT
                 ),
     CTECASE AS (SELECT CASE WHEN C.APPLIED_AMT - ISNULL((SELECT LINE_AMT FROM CTELINE  ),0) < 0   THEN C.LINE_AMT  
                             WHEN C.APPLIED_AMT - ISNULL(( SELECT LINE_AMT FROM CTELINE ),0) > = C.LINE_AMT THEN 0
                             ELSE C.LINE_AMT - C.APPLIED_AMT+ISNULL((  SELECT LINE_AMT FROM CTELINE ),0)      END AS CTE_INVOICE_BALANCE
                       ,C.BUSINESS_UNIT,C.EXT_ORG_ID, C.INVOICE_ID FROM PS_SIS_SF_EO_INV_V C, CTELINE CTEL WHERE  CTEL.BUSINESS_UNIT = C.BUSINESS_UNIT 
                        GROUP BY C.BUSINESS_UNIT, C.EXT_ORG_ID, C.INVOICE_ID, C.CONTACT_NAME,C.APPLIED_AMT,C.LINE_AMT 
                 )
SELECT A.BUSINESS_UNIT  
, A.EXT_ORG_ID  
, A.INVOICE_ID  
, A.CONTACT_NAME  
, SUM(A.LINE_AMT) AS INVOICE_AMT 
, SUM(CTE_INVOICE_BALANCE) AS INVOICE_BALANCE
, 0.0 
  FROM PS_SIS_SF_EO_INV_V A, CTECASE CTEC WHERE  CTEC.BUSINESS_UNIT = A.BUSINESS_UNIT AND A.EXT_ORG_ID = CTEC.EXT_ORG_ID AND 
   A.INVOICE_ID = CTEC.INVOICE_ID 
  GROUP BY A.BUSINESS_UNIT, A.EXT_ORG_ID, A.INVOICE_ID, A.CONTACT_NAME

Answer 1

您重写原始查询是正确的。它包含三个相同的子查询，写得太复杂了。这是我对查询的看法：

select
  business_unit,
  ext_org_id,
  invoice_id,
  contact_name,
  sum(line_amt) as invoice_amt,
  sum
  (
    case
      when applied_amt < sum_line_amt then line_amt
      when applied_amt >= sum_line_amt + line_amt then 0
      else line_amt - applied_amt + sum_line_amt
    end
  ) as invoice_balance,
  0.0
from
(
  select 
    a.*,
    coalesce
    (
      ( 
        select sum(il.line_amt) 
        from ps_item_line_sf il
        where il.business_unit = a.business_unit 
        and il.common_id = a.ext_org_id 
        and il.item_nbr = a.item_nbr 
        and il.item_type_cd = a.item_type_cd 
        and il.line_amt * 100000 + il.line_seq_nbr > a.line_amt * 100000 + a.line_seq_nbr
      ), 0
    ) as sum_line_amt
  from ps_sis_sf_eo_inv_v a
) mydata
group by business_unit, ext_org_id, invoice_id, contact_name;

我保留了原来的 table 别名 A，尽管我不喜欢它，因为它不便于记忆。但是我不知道名字ps_sis_sf_eo_inv_v的哪一部分应该作为别名，当然。

如果我没有出错，那么这个查询应该和原来的查询完全一样，并且很容易转换。