访问标准不等于零

Question

我无法使用以下查询过滤掉零字段。许多“3 年平均”或“Comp Usage”字段为零的记录仍包含在结果中。

删除“0”或“Is Not Null”标准不会改变输出表中的任何内容。 Access 正在生成以下 SQL：

SELECT 
[active plant parts made from dept produced components usage].assembly_item_no, 
[active plant parts made from dept produced components usage].component_item_no, 
[active plant parts made from dept produced components usage].component_qty, 
[active plant parts made from dept produced components usage].[3 yr average], 
[active plant parts made from dept produced components usage].[comp usage], 
noetix_sys_invus_category_all.[a$cat$item_type] 
INTO   [department component usage and assembly type] 
FROM   [active plant parts made from dept produced components usage] 
       INNER JOIN noetix_sys_invus_category_all 
               ON 
[active plant parts made from dept produced components usage].assembly_item_no = 
noetix_sys_invus_category_all.[a$item$item_number] 
WHERE  ( ( ( 
[active plant parts made from dept produced components usage].[3 yr average] 

) 
<> 0 ) 
  AND ( ( 
  [active plant parts made from dept produced components usage].[comp usage] ) 
<> 0 ) 
  AND ( ( noetix_sys_invus_category_all. [a$cat$item_type] ) = "aft" ) ) 
 OR ( ( ( 
[active plant parts made from dept produced components usage].[3 yr average] 
) 
IS NOT NULL ) 
  AND ( ( 
  [active plant parts made from dept produced components usage].[comp usage] 
        ) 
    IS NOT NULL ) 
  AND ( ( noetix_sys_invus_category_all.[a$cat$item_type] ) = "aft+" ) ) 
OR (( ( noetix_sys_invus_category_all.[a$cat$item_type] ) = "oem" )) 
OR (( ( noetix_sys_invus_category_all.[a$cat$item_type] ) = "oem+" )) 
ORDER  BY 
[active plant parts made from dept produced components usage].[3 yr average] DESC, 
[active plant parts made from dept produced components usage].[comp usage] DESC, 
noetix_sys_invus_category_all.[a$cat$item_type]; 

感谢您的帮助。

Answer 1

读取 Criteria 行是一个 AND 语句，因此，例如，Is Not Null 仅适用于“AFT+”。

使用单行和 And（或 Or）关键字。示例（在单个单元格中输入）：

<>0 And Is Not Null

"X" Or "Y" Or "Z"

或对每个“X”、“Y”等行重复第一个表达式。

Answer 2

也许使用in 和nz 进行简化。我说可能是因为我不完全确定您所追求的预期结果。

WHERE nz([Active Plant Parts Made From Dept Produced Components Usage].[3 Yr Average],0)<>0
  AND nz([Active Plant Parts Made From Dept Produced Components Usage].[Comp Usage],0)<>0 
  AND NOETIX_SYS_INVUS_CATEGORY_ALL.[A$CAT$ITEM_TYPE] in("AFT","AFT+","OEM","OEM+")

Or 语句通常对引擎进行评估是昂贵的；因此，如果我们可以使用 IN 一次进行多个评估，我们将获得性能优势。

使用nz，我们将空值转换为0，然后将其从结果中排除。因此，在 3 年平均或 comp 使用量均为 null 或零的情况下，记录将被排除在外。