Oracle Minus查询.如果顶级SQL和底部SQL不包含NULL,如何使用NULLS获得结果？

Question

怎么可能这个SQL ...

CREATE TABLE NewTable AS
    SELECT A,B,C FROM Table1
    minus
    SELECT A, B, C From Table2

...当Table1或Table2在A列中都没有NULL值时,在A列中创建一个具有NULL值的新表？

但另一方面,这个SQL ......

SELECT * FROM
(
   SELECT A,B,C FROM Table1
    minus
    SELECT A, B, C From Table2
) 
WHERE A IS NULL 

没有返回行!

看起来不一致!

我认为这是Oracle中的一个错误.

当然真正的SQL要复杂得多,但我相信这准确地说明了问题的本质.

UPDATE

这是ACTUAL SQL:

我执行了这个声明:

CREATE TABLE MyMinus
AS
select 
*
FROM
---begin main query 
(
SELECT expenditure_item_date, expenditure_org, expenditure_type,
       f_amount_billed, f_amount_billed_fc, f_amount_billed_us,
       f_bl_creation_date, f_catalog_source, f_catalog_type, f_company,
       f_company_code, f_cost_center_num, f_cuic, f_currency_code,
       f_destination_type_code, f_distribution_id, f_distribution_num,
       f_exchange_rate, f_extract_date, f_gl_account,
       f_isms_jamis_project_num, f_line_id, f_local_use, f_location_num,
       f_need_by_date, f_org_id, f_po_line_num, f_po_num, f_po_release_num,
       f_project, f_project_num, f_promised_date, f_quantity_billed,
       f_quantity_cancelled, f_quantity_delivered, f_quantity_ordered,
       f_rel_approved_flag, f_rel_cancelled_flag, f_rel_cancel_date,
       f_rel_closed_code, f_rel_hold_flag, f_rel_revision_num, f_task_num
  FROM dw_mgr.po_distributions_curr_fct a
 WHERE EXISTS (
          SELECT 1
            FROM dw_mgr.po_distributions_curr_fct b,
                 dw_mgr.po_lines_curr_fct,
                 dw_mgr.po_header_curr_fct
           WHERE a.ROWID = b.ROWID
             AND b.f_cuic = dw_mgr.po_lines_curr_fct.f_cuic
             AND b.f_line_id = dw_mgr.po_lines_curr_fct.f_line_id
             AND dw_mgr.po_lines_curr_fct.f_cuic =
                                              dw_mgr.po_header_curr_fct.f_cuic
             AND dw_mgr.po_lines_curr_fct.f_header_id =
                                         dw_mgr.po_header_curr_fct.f_header_id
             AND dw_mgr.po_header_curr_fct.f_header_creation_date <
                                      ADD_MONTHS (TRUNC (SYSDATE, 'YEAR'),
                                                  -48)
             AND dw_mgr.po_header_curr_fct.f_po_status IN
                                                 ('CLOSED', 'FINALLY CLOSED'))

MINUS 

SELECT expenditure_item_date, expenditure_org, expenditure_type,
       f_amount_billed, f_amount_billed_fc, f_amount_billed_us,
       f_bl_creation_date, f_catalog_source, f_catalog_type, f_company,
       f_company_code, f_cost_center_num, f_cuic, f_currency_code,
       f_destination_type_code, f_distribution_id, f_distribution_num,
       f_exchange_rate, f_extract_date, f_gl_account,
       f_isms_jamis_project_num, f_line_id, f_local_use, f_location_num,
       f_need_by_date, f_org_id, f_po_line_num, f_po_num, f_po_release_num,
       f_project, f_project_num, f_promised_date, f_quantity_billed,
       f_quantity_cancelled, f_quantity_delivered, f_quantity_ordered,
       f_rel_approved_flag, f_rel_cancelled_flag, f_rel_cancel_date,
       f_rel_closed_code, f_rel_hold_flag, f_rel_revision_num, f_task_num
  FROM arch_fct.po_distributions_curr_fct a
 WHERE EXISTS (
          SELECT 1
            FROM arch_fct.po_distributions_curr_fct b,
                 arch_fct.po_lines_curr_fct,
                 arch_fct.po_header_curr_fct
           WHERE a.ROWID = b.ROWID
             AND b.f_cuic = arch_fct.po_lines_curr_fct.f_cuic
             AND b.f_line_id = arch_fct.po_lines_curr_fct.f_line_id
             AND arch_fct.po_lines_curr_fct.f_cuic =
                                            arch_fct.po_header_curr_fct.f_cuic
             AND arch_fct.po_lines_curr_fct.f_header_id =
                                       arch_fct.po_header_curr_fct.f_header_id
             AND arch_fct.po_header_curr_fct.f_header_creation_date <
                                      ADD_MONTHS (TRUNC (SYSDATE, 'YEAR'),
                                                  -48)
             AND arch_fct.po_header_curr_fct.f_po_status IN
                                                 ('CLOSED', 'FINALLY CLOSED'))

) 

然后这个.请注意,具有NULL值F_DISTRIBUTION_ID的行已插入到创建的表中.

SELECT COUNT(*) from MyMinus WHERE F_DISTRIBUTION_ID IS NULL

--17行

然而当我执行这个:

select 
*
FROM
---begin main query 
(
SELECT expenditure_item_date, expenditure_org, expenditure_type,
       f_amount_billed, f_amount_billed_fc, f_amount_billed_us,
       f_bl_creation_date, f_catalog_source, f_catalog_type, f_company,
       f_company_code, f_cost_center_num, f_cuic, f_currency_code,
       f_destination_type_code, f_distribution_id, f_distribution_num,
       f_exchange_rate, f_extract_date, f_gl_account,
       f_isms_jamis_project_num, f_line_id, f_local_use, f_location_num,
       f_need_by_date, f_org_id, f_po_line_num, f_po_num, f_po_release_num,
       f_project, f_project_num, f_promised_date, f_quantity_billed,
       f_quantity_cancelled, f_quantity_delivered, f_quantity_ordered,
       f_rel_approved_flag, f_rel_cancelled_flag, f_rel_cancel_date,
       f_rel_closed_code, f_rel_hold_flag, f_rel_revision_num, f_task_num
  FROM dw_mgr.po_distributions_curr_fct a
 WHERE EXISTS (
          SELECT 1
            FROM dw_mgr.po_distributions_curr_fct b,
                 dw_mgr.po_lines_curr_fct,
                 dw_mgr.po_header_curr_fct
           WHERE a.ROWID = b.ROWID
             AND b.f_cuic = dw_mgr.po_lines_curr_fct.f_cuic
             AND b.f_line_id = dw_mgr.po_lines_curr_fct.f_line_id
             AND dw_mgr.po_lines_curr_fct.f_cuic =
                                              dw_mgr.po_header_curr_fct.f_cuic
             AND dw_mgr.po_lines_curr_fct.f_header_id =
                                         dw_mgr.po_header_curr_fct.f_header_id
             AND dw_mgr.po_header_curr_fct.f_header_creation_date <
                                      ADD_MONTHS (TRUNC (SYSDATE, 'YEAR'),
                                                  -48)
             AND dw_mgr.po_header_curr_fct.f_po_status IN
                                                 ('CLOSED', 'FINALLY CLOSED'))

MINUS 

SELECT expenditure_item_date, expenditure_org, expenditure_type,
       f_amount_billed, f_amount_billed_fc, f_amount_billed_us,
       f_bl_creation_date, f_catalog_source, f_catalog_type, f_company,
       f_company_code, f_cost_center_num, f_cuic, f_currency_code,
       f_destination_type_code, f_distribution_id, f_distribution_num,
       f_exchange_rate, f_extract_date, f_gl_account,
       f_isms_jamis_project_num, f_line_id, f_local_use, f_location_num,
       f_need_by_date, f_org_id, f_po_line_num, f_po_num, f_po_release_num,
       f_project, f_project_num, f_promised_date, f_quantity_billed,
       f_quantity_cancelled, f_quantity_delivered, f_quantity_ordered,
       f_rel_approved_flag, f_rel_cancelled_flag, f_rel_cancel_date,
       f_rel_closed_code, f_rel_hold_flag, f_rel_revision_num, f_task_num
  FROM arch_fct.po_distributions_curr_fct a
 WHERE EXISTS (
          SELECT 1
            FROM arch_fct.po_distributions_curr_fct b,
                 arch_fct.po_lines_curr_fct,
                 arch_fct.po_header_curr_fct
           WHERE a.ROWID = b.ROWID
             AND b.f_cuic = arch_fct.po_lines_curr_fct.f_cuic
             AND b.f_line_id = arch_fct.po_lines_curr_fct.f_line_id
             AND arch_fct.po_lines_curr_fct.f_cuic =
                                            arch_fct.po_header_curr_fct.f_cuic
             AND arch_fct.po_lines_curr_fct.f_header_id =
                                       arch_fct.po_header_curr_fct.f_header_id
             AND arch_fct.po_header_curr_fct.f_header_creation_date <
                                      ADD_MONTHS (TRUNC (SYSDATE, 'YEAR'),
                                                  -48)
             AND arch_fct.po_header_curr_fct.f_po_status IN
                                                 ('CLOSED', 'FINALLY CLOSED'))

) 
WHERE

f_distribution_id is null

我得到0行.

为什么将记录插入临时表似乎会引入具有NULL DIST ID的行？

这个由自定义数据归档程序动态生成的减去查询的SQL会尝试验证应该在DW_MGR模式中归档的数据实际上是否已复制到ARCH_FCT(归档)模式.它返回的差异包括17条记录,其中MyMinus临时表中的F_DISTRIBUTION_ID与源DW_MG.PO_DISTRIBUTIONS_CURR_FCT表中的F_DISTRIBUTION_ID不匹配,因为它们是NULL.因此,存档过程是在发现差异时进行设计的.问题是为什么存在差异,即当NULL值不在SOURCE PO_DISTRIBUTIONS_CURR_FCT表中时,NULL值如何进入MyMinus表？

编辑:

拥有Oracle META访问权限的人可以发布以下Oracle错误的信息.我被提到了他们,但我签约合同找到了我的合作伙伴,他可以告诉我我们的支持ID#是什么.我最终会发现,但很快就会知道.如果您不想发布它,请考虑以下错误引用作为我的问题的潜在相关信息:

Bug 8209309: MINUS IS SHOWING DIFFERENCES WITH CTAS + INSERT 
Bug 7834950: WRONG RESULTS WITH MINUS OPERATOR

Answer 1

别再破坏你的排骨了。这是一个 Oracle 错误。我会向你证明：

首先，它必须是第一个为 DISTRIBUTION ID 返回 NULL 的 SQL，因此隔离该 SQL，我们将其称为“SQL1”。

好的，为了讨论起见，让我们简化 SQL1，并假设它具有以下格式：

CREATE TABLE TempTable AS 
SELECT
   F_DISTRIBUTION_ID,
   FIELD2,
   FIELD3,...FIELD99

FROM WHATEVER 
WHERE WHATEVER

然后，您会发现，当执行此命令时，您会找到具有 NULL DIST ID 的行：

SELECT COUNT(*) FROM TempTable WHERE F_DISTRIBUTION_ID IS NULL
--Some positive number of rows returned.

如果 Oracle 不是废话，您可以更改所选字段的数量，以便仅选择 F_DISTRIBUTION_ID，并且当您计算 F_DISTRIBUTION_ID 为 NULL 值的行数时，您会得到相同的结果，对吧？正确的！但事实并非如此，因为 Oracle 是一只不可靠的恐龙。

尝试这个：

CREATE TABLE TempTable AS 
SELECT
   F_DISTRIBUTION_ID
FROM WHATEVER 
WHERE WHATEVER

SELECT COUNT(*) FROM TempTable WHERE F_DISTRIBUTION_ID IS NULL

我敢打赌，你会返回 0 行。

现在，打电话给 Microsoft 并告诉他们您想要升级到 SQL Server 2008 R2。