跨多组 Access 表的 SQL 计数求和查询

Question

我有一个 MS Access 查询（使用 SQL 创建），它计算设备状态表中日期列中非 NULL 值的出现次数。该表包含特定制造工厂的所有设备。该查询还计算设备总数，我们没有 NULL 值。共有 12 个不同的工厂，每个工厂都有自己相同的一组 Access 表。我需要创建一个整合的 SQL 查询，将每个计数的总和创建为所有植物的主计数。

status 表的结构，名为 '_review_status' 是：

equip_number, text
review_a_analysis, date
review_b_analysis, date 
review_c_analysis, date
review_d_analysis, date
review_e_analysis, date
review_f_analysis, date
review_g_analysis, date

工作查询的结果（在一张表上）如下所示。

a   b   c   d   e   f   g   equip_count
17  31  0   94  13  12  44  1249

新的结果应该和上面的完全一样，只是数字都会变大，因为查询会查看所有 12 组表。

这是有效的单表查询：

SELECT 
Count(dept1_review_status.review_a_analysis) AS a, 
Count(dept1_review_status.review_b_analysis) AS b, 
Count(dept1_review_status.review_c_analysis) AS c, 
Count(dept1_review_status.review_d_analysis) AS d, 
Count(dept1_review_status.review_e_analysis) AS e, 
Count(dept1_review_status.review_f_analysis) AS f, 
Count(dept1_review_status.review_g_analysis) AS g,
Count(dept1_equipment.dept1_equip_number) AS equip_count
FROM dept1_equipment 
LEFT JOIN dept1_review_status 
ON dept1_equipment.dept1_equip_number = 
dept1_review_status.dept1_equip_number;

dept1_equipment 表上的连接用于获取每个部门中所有设备的完整计数。

非常感谢。

鲍勃

Answer 1

考虑对所有 12 个 group by 聚合查询运行联合查询，然后使用保存的联合查询运行另一个最终聚合查询：

联合

SELECT 
   Count(dept1_review_status.review_a_analysis) AS a, 
   Count(dept1_review_status.review_b_analysis) AS b, 
   Count(dept1_review_status.review_c_analysis) AS c, 
   Count(dept1_review_status.review_d_analysis) AS d, 
   Count(dept1_review_status.review_e_analysis) AS e, 
   Count(dept1_review_status.review_f_analysis) AS f, 
   Count(dept1_review_status.review_g_analysis) AS g,
   Count(dept1_equipment.dept1_equip_number) AS equip_count
FROM dept1_equipment LEFT JOIN dept1_review_status 
ON dept1_equipment.dept1_equip_number = dept1_review_status.dept1_equip_number;

UNION ALL

SELECT 
   Count(dept2_review_status.review_a_analysis) AS a, 
   Count(dept2_review_status.review_b_analysis) AS b, 
   Count(dept2_review_status.review_c_analysis) AS c, 
   Count(dept2_review_status.review_d_analysis) AS d, 
   Count(dept2_review_status.review_e_analysis) AS e, 
   Count(dept2_review_status.review_f_analysis) AS f, 
   Count(dept2_review_status.review_g_analysis) AS g,
   Count(dept2_equipment.dept2_equip_number) AS equip_count
FROM dept2_equipment LEFT JOIN dept2_review_status 
ON dept2_equipment.dept2_equip_number = dept2_review_status.dept2_equip_number;

UNION ALL

SELECT 
   Count(dept3_review_status.review_a_analysis) AS a, 
   Count(dept3_review_status.review_b_analysis) AS b, 
   Count(dept3_review_status.review_c_analysis) AS c, 
   Count(dept3_review_status.review_d_analysis) AS d, 
   Count(dept3_review_status.review_e_analysis) AS e, 
   Count(dept3_review_status.review_f_analysis) AS f, 
   Count(dept3_review_status.review_g_analysis) AS g,
   Count(dept3_equipment.dept3_equip_number) AS equip_count
FROM dept3_equipment LEFT JOIN dept3_review_status 
ON dept3_equipment.dept3_equip_number = dept3_review_status.dept3_equip_number;

...other 9 tables...

最终

SELECT Sum(unionqry.a), 
       Sum(unionqry.b), 
       Sum(unionqry.c), 
       Sum(unionqry.d), 
       Sum(unionqry.e), 
       Sum(unionqry.f), 
       Sum(unionqry.g), 
       Sum(unionqry.h), 
       Sum(unionqry.equip_count)
FROM unionqry

或者，如果 MS Access 允许，您可以根据复杂性将所有内容合并到一个查询中：

SELECT Sum(unionqry.a), 
       Sum(unionqry.b), 
       Sum(unionqry.c), 
       Sum(unionqry.d), 
       Sum(unionqry.e), 
       Sum(unionqry.f), 
       Sum(unionqry.g), 
       Sum(unionqry.h), 
       Sum(unionqry.equip_count)
FROM (...above union query)... As unionqry