的Oracle SQL查詢沒有顯示正確的價值

Question

我有下列的表：

• ID
• 技術
• name_event
• time_event

我算的數表中的值用以下查詢

select 1, 'Folder' as "Technology", 'Status' as "Name_Event", count(dm1.id) as "number of items", max(TO_CHAR(TO_DATE('20000101','yyyymmdd')+(SYSDATE - dm1.time_event),'hh24:mi:ss')) as "Time in system" 
    from db dm1 join db dm2 on dm1.id = dm2.id 
    where dm1.technology = 'Folder' and dm1.name_event = 'status1' and NOT EXISTS(SELECT 1 FROM db dm2 WHERE dm2.name_event = 'status2' and dm2.id = dm1.id) 

個

我以下插入

INSERT INTO DB(id, technology, name_event, time_event) VALUES(1,'Folder', 'status1', 01:00:00); 
    INSERT INTO DB(id, technology, name_event, time_event) VALUES(2,'Folder', 'status1', 01:00:00); 
    INSERT INTO DB(id, technology, name_event, time_event) VALUES(3,'Folder', 'status1', 01:00:00); 
    INSERT INTO DB(id, technology, name_event, time_event) VALUES(4,'Folder', 'status1', 01:00:00); 
    INSERT INTO DB(id, technology, name_event, time_event) VALUES(5,'Folder', 'status1', 01:00:00); 
    INSERT INTO DB(id, technology, name_event, time_event) VALUES(6,'Folder', 'status1', 01:00:00); 
    INSERT INTO DB(id, technology, name_event, time_event) VALUES(7,'Folder', 'status1', 01:00:00); 
    INSERT INTO DB(id, technology, name_event, time_event) VALUES(8,'Folder', 'status1', 01:00:00); 
    INSERT INTO DB(id, technology, name_event, time_event) VALUES(9,'Folder', 'status1', 01:00:00); 
    INSERT INTO DB(id, technology, name_event, time_event) VALUES(10,'Folder', 'status1', 01:00:00); 
INSERT INTO DB(id, technology, name_event, time_event) VALUES(4,'Folder', 'status2', 02:00:00); 
INSERT INTO DB(id, technology, name_event, time_event) VALUES(1,'Folder', 'status2', 03:00:00); 

我在狀態1插入的10行和移動2至狀態2，所以應該有狀態1 8項時我執行查詢，但結果是10。 ..

我在做什麼錯？

Answer 1

在您的查詢，你是join荷蘭國際集團dm2但隨後使用NOT EXISTS相關子查詢（和使用子查詢中相同的別名）。我無法用我的設置複製這個問題，但這肯定會讓一些東西混淆！所以嘗試沒有第二個數據庫的副本，並保持NOT EXISTS：

select 1, 'Folder' as "Technology", 'Status' as "Name_Event", count(dm1.id) as "number of items", max(TO_CHAR(TO_DATE('20000101','yyyymmdd')+(SYSDATE - dm1.time_event),'hh24:mi:ss')) as "Time in system" 
from db dm1 
where dm1.technology = 'Folder' and dm1.name_event = 'status1' and NOT EXISTS(SELECT 1 FROM db dm2 WHERE dm2.name_event = 'status2' and dm2.id = dm1.id) 

Answer 2

您在表中使用了2個以上的插入，所以現在您有10 + 2共12個插入，要移動數據，請使用update語句。

update db set name_event='status2' where id=4; 
update db set name_event='status4' where id=1;