Question

显示两个表都不可用的应用程序计数或报告（服务，服务完成）

注意：服务= Application_no（编号） Services_Done = Application_no（ Varchar2 ）

SELECT Count(Application_no)
FROM services
WHERE Application_cat = 60
and To_char(Delivery_date,'yyyy') between 2006 and 2016
and Service_status = 210

SELECT services.application_no
FROM services
WHERE Application_status = 15
and To_char(Directors_Dependency_Date,'yyyy') between 2006 and 2016
MINUS
SELECT services.application_no
FROM services
JOIN services_contract ON services.application_no=services_contract.application_no

结果：

如果应用程序在服务中可用，但在services_done中不可用-包括它如果两个表中的Application_no =排除它

Answer 1

如果我理解正确，则可以使用NOT EXISTS子句。查看下面的示例

SELECT Count(Application_no) FROM services s
WHERE Application_cat = 60
and To_char(Delivery_date,'yyyy') between 2006 and 2016
and Service_status = 210
and not exists
(
   select 1 from services_done t2 where t2.cond = s.cond
)

Answer 2

如果Application在Services和Services_Done中具有相同的ID，则可以像这样进行LEFT JOIN：

SELECT Count(S.App)
FROM Services as S
LEFT JOIN Services_Done as SD
ON S.App = SD.App
WHERE SD.App is not null;

如果满足条件WHERE，则意味着为对象Services找到了Services_Done和Application之间的链接。

显示两个表均不可用的应用程序计数或报告

2 个答案: