Oracle SQL - 左加2表不運行

Question

任何人有任何想法，爲什麼當我試圖運行此查詢時，它只是運行永遠不會停止??

「With」子句中的查詢自行運行正常。只是當我嘗試加入他們，我無法讓它正常運行？

--Process name and input 
With ProcessIn as 
(
select Data.Scan_time, equipment.equipment_desc, data.serial_number 

from Data, equipment 

where Data.equipment = equipment.equipm_barcode and data.quality_plan = 'N/A' and  data.error_code = 'N/A' 
) 

--Total process defects 
,ProcessDefect as 
(
select Data.Scan_time, equipment.equipment_desc, data.serial_number 

from Data, equipment 

where Data.equipment = equipment.equipm_barcode and (data.quality_plan <> 'N/A' or  data.error_code <> 'N/A') 
) 

Select concat(to_char(ProcessIn.SCAN_TIME, 'mm'), to_char(ProcessIn.SCAN_TIME, 'dd')) as "Date", ProcessIn.equipment_desc, count(ProcessIn.serial_number), count(ProcessDefect.serial_number) 

from ProcessIn 
Left Join ProcessDefect 
On concat(to_char(ProcessIn.SCAN_TIME, 'mm'),to_char(ProcessIn.SCAN_TIME, 'dd')) = concat(to_char(ProcessDefect.SCAN_TIME, 'mm'),to_char(ProcessDefect.SCAN_TIME, 'dd')) 
and ProcessIn.equipment_desc = ProcessDefect.equipment_desc 

group by concat(to_char(ProcessIn.SCAN_TIME, 'mm'), to_char(ProcessIn.SCAN_TIME, 'dd')), ProcessIn.equipment_desc 
; 

---

UPDATE 20110816 我用了一些建議，以改進我的查詢，但沒有成功。有人有其他建議嗎？此外，無論如何檢查我的索引是正確使用，因爲我是新的創建/使用它們。我只是使用Oracle接口來創建基於serial_number和smalldate的索引。

感謝

With ProcessIn as 
(
select data.smalldate, mip.mip_step_description, data.part_serial_number 

from Data, MIP 

where Data.equipment = MIP.equipment and data.quality_plan is null and data.error_code is null 
) 

,ProcessDefect as 
(
select data.smalldate, mip.mip_step_description, data.part_serial_number 

from Data, MIP 

where Data.equipment = MIP.equipment and (data.quality_plan is not null or data.error_code is not null) 
) 

Select ProcessIn.smalldate, ProcessIn.mip_step_description, count(ProcessIn.part_serial_number), count(ProcessDefect.part_serial_number) 

from ProcessIn 
Left Join ProcessDefect 
On ProcessIn.smalldate = ProcessDefect.smalldate 
and ProcessIn.mip_step_description = ProcessDefect.mip_step_description 

group by ProcessIn.smalldate, ProcessIn.mip_step_description 

UPDATE 110820

所以我已經取得一些進展，但需要幫助搞清楚最後一兩件事。我改變了查詢結構看現在這個樣子

select data.smalldate, mip.mip_step_description, error_code.error_code_en, count(case when (error_code is null and quality_plan is null) then data.part_serial_number end) as "Input", count(case when error_code is not null then data.part_serial_number end) as "Defects" 

from Data 

left join MIP 
On data.equipment = mip.equipment 

left join error_code 
on data.error_code = error_code.error_code_sn 

group by data.smalldate, mip.mip_step_description, error_code.error_code_en 

order by data.smalldate, mip.mip_step_description, count(data.part_serial_number) desc 

正如你可以看到在SELECT語句中，我使用的是在我的計數功能case語句。這工作正常。數據輸出像這樣

Date MIP_Desc Error_Code Input Defects 
1/1/2011 MIP Z (null)  100  0 
1/1/2011 MIP Z A   0  10 
1/1/2011 MIP Z B   0  15 

我想在輸入欄相同的輸入值，以填補整個具有相同的日期和MIP的所有行。

輸出應該是這樣的

Date MIP_Desc Error_Code Input Defects 
1/1/2011 MIP Z (null)  100  0 
1/1/2011 MIP Z A   100  10 
1/1/2011 MIP Z B   100  15 

任何提示？再次感謝您的幫助

Answer 1

我不是一個Oracle開發者，而是一個巨大的紅色標誌，我是你的JOIN語句兩側使用嵌套函數調用的：

On concat(to_char(ProcessIn.SCAN_TIME, 'mm'),to_char(ProcessIn.SCAN_TIME, 'dd')) = 
    concat(to_char(ProcessDefect.SCAN_TIME, 'mm'),to_char(ProcessDefect.SCAN_TIME, 'dd')) 

在SQL Server中，這是一個非常強大的指標，優化器在使用索引執行聯接操作時會遇到麻煩。如果您的子查詢生成大型記錄集，則JOIN可能需要很長時間才能完成。

如果您可以修改ON子句以不要求函數調用（如果可能的話，至少在一個上），它可能會幫助性能相當多。

Answer 2

另一種方式來簡化此

的concat（TO_CHAR（ProcessIn.SCAN_TIME， '毫米'），TO_CHAR（ProcessIn.SCAN_TIME， 'DD'））= CONCAT（TO_CHAR（ProcessDefect.SCAN_TIME， '毫米'） ，TO_CHAR（ProcessDefect.SCAN_TIME， 'DD'））

是說像

TO_CHAR（ProcessIn.SCAN_TIME， 'DDMM'）= TO_CHAR（ProcessDefect.SCAN_TIME， 'DDMM'）。

爲了提高性能，您可以創建基於功能的索引

在生產工程過程創建索引scan_time_idx（TO_CHAR（生產工程過程。SCAN_TIME，'ddmm'））;

在ProcessIn上創建索引scan_time_idx（to_char（ProcessDefect.SCAN_TIME，'ddmm'））;

有關基於函數的索引的更多信息，請參見http://www.akadia.com/services/ora_function_based_index_2.html 。

或者，您可以在to_char（tablename.SCAN_TIME，'ddmm'）格式的'data'表中將scan_time存儲在名爲monthday的單獨列中，並索引新列。

製作完畢後，將查詢然後是這樣的： -

With ProcessIn as 
(
select Data.Scan_time, equipment.equipment_desc, data.serial_number,Data.monthday 

from Data, equipment 

where Data.equipment = equipment.equipm_barcode and data.quality_plan = 'N/A' and  data.error_code = 'N/A' 
) 

--Total process defects 
,ProcessDefect as 
(
select Data.Scan_time, equipment.equipment_desc, data.serial_number,Data.monthday 

from Data, equipment 

where Data.equipment = equipment.equipm_barcode and (data.quality_plan <> 'N/A' or   data.error_code <> 'N/A') 
) 

Select monthday as "Date", ProcessIn.equipment_desc,          count(ProcessIn.serial_number),  count(ProcessDefect.serial_number) 

from ProcessIn 
Left Join ProcessDefect 
On ProcessIn.monthday = ProcessDefect.monthday 
and ProcessIn.equipment_desc = ProcessDefect.equipment_desc 
group by ProcessIn.monthday, ProcessIn.equipment_desc 
;