Question

这个SQL怎么可能......

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

...在A列中创建一个包含NULL值的新表当Table1或Table2在A列中都没有NULL值时？

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

不返回任何行！

似乎不一致！

我认为这是Oracle中的一个错误。

当然，真正的SQL要复杂得多，但我相信这可以准确地说明问题的本质。

更新

这是ACTUAL SQL：

我执行了这个陈述：

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，当我执行此操作时：

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（存档）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，请将以下错误引用视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

退出你的排骨。这是一个Oracle错误。我会向你证明：

首先，它必须是第一个返回NULLS for DISTRIBUTION ID的SQL，所以要隔离该SQL并将其称为“SQL1”。

好的，让我们为了讨论而简化SQL1并说它是这种格式：

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

FROM WHATEVER 
WHERE WHATEVER

然后，您发现在执行此操作时，您将找到具有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，以便只选择F_DISTRIBUTION_ID，当您计算NULL值为F_DISTRIBUTION_ID的行数时，您会得到相同的结果，对吧？对！但事实并非如此，因为甲骨文是一种不可靠的恐龙。

试试这个：

CREATE TABLE TempTable AS 
SELECT
   F_DISTRIBUTION_ID
FROM WHATEVER 
WHERE WHATEVER

SELECT COUNT(*) FROM TempTable WHERE F_DISTRIBUTION_ID IS NULL

我给甜甜圈打钱，你得到0行。

现在，请调用Microsoft并告诉他们您要升级到SQL Server 2008 R2。

Answer 2

首先，我将摆脱ROWID加入ROWID。然后我会让表格变得独一无二（不要在MINUS上方的查询和MINUS下面的查询中重复使用'a'和'b'。）

最后，我会查看这17行并尝试在“dw_mgr.po_distributions_curr_fct”中找到匹配的记录，并使用DUMP（F_DISTRIBUTION_ID）查看列值的奇怪之处。

Answer 3

一般不应该。

唯一可能的情况是，如果你有一些高级安全功能（细粒度访问控制），优化器可以看到A在table1 / table2中不能为空，所以返回零行，但FGAC开始阻止你通过返回null来查看列中的实际值。

EDIT。 “使用[虚拟专用数据库]列屏蔽行为，所有行都会显示，甚至是那些引用敏感列的行。但是，敏感列显示为NULL值。”

http://download.oracle.com/docs/cd/E11882_01/network.112/e10574/vpd.htm#i1014682

Answer 4

当我插入MyMinus时，我认为F_DISTRIBUTION_ID可能为NULL的唯一方法是，如果它以某种方式返回NULL，就在第一个查询中。

重现这个（在9i和10g上）：

SQL> INSERT INTO table1 VALUES (NULL, 2, 3);

1 row created.

SQL> INSERT INTO table2 VALUES (1, 2, 3);

1 row created.

SQL> SELECT * 
  2  FROM (
  3    SELECT a, b, c FROM table1
  4    MINUS
  5    SELECT a, b, c FROM table2);

         A          B          C
---------- ---------- ----------
                    2          3

但是，关于查询在自己运行时不返回任何行...这是其他的东西。一个错误不会让我感到惊讶......但你试过取出那些EXISTS吗？当然，有许多不同的方法，但也许所有这些子查询都会在内存中引起一些有趣的事情。

例如：

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
       dw_mgr.po_lines_curr_fct,
       dw_mgr.po_header_curr_fct
  WHERE a.f_cuic = dw_mgr.po_lines_curr_fct.f_cuic
    AND a.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,
       arch_fct.po_lines_curr_fct,
       arch_fct.po_header_curr_fct
 WHERE a.f_cuic = arch_fct.po_lines_curr_fct.f_cuic
   AND a.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')

Answer 5

我有一个可能相关的问题，当使用一堆复杂的视图并存在时，它开始是MINUS的一个问题。我把它缩小到一个可能的优化问题 - 你可以通过使用像“upper（F_DISTRIBUTION_ID）IS NULL”这样的东西来阻止优化器基于“F_DISTRIBUTION_ID IS NULL”搞乱事情来解决它。

在这些情况下，几乎不可能为错误报告创建一个简化的测试用例 - 它可能只发生在非常特定的场景中（它不像MINUS毕竟会被完全打破）。根据我的问题，我根本无法减少查询，并且仍然会发生。

仅供参考我的问题是一个查询，它基本上将一堆东西加入到源表中，称之为Employee。我在Employee的主键上有一个where子句 - 如果我做了一个EmployeeId = foo的地方，它将返回一个额外的行，其中的空值不应该是（内部连接的表中的列） - 如果我这样做的话a upper（EmployeeId）= foo然后我会得到正确的结果。显然，EmployeeId值来自与谓词匹配的所有行中的相同单元格 - 所以它显然是一个错误。

Answer 6

我刚遇到同样的错误。并构建一个if else条件来获取这些值：D

表1

A      !      B

null          35

'if else'条件：P

select 
Case
WHEN  a."Add" >= '0' THEN to_number(a."Add" - b."Cease" )

ELSE (b."Cease")*-1
End  as "X"
from table 1

答案

-35

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

6 个答案: