如何在PL / SQL過程中臨時存儲數據？

Question

我是PL / SQL的新手。 我在名為“ FLEX_PANEL_INSPECTIONS”的初始表中有數據，我正在嘗試使用PL / SQL過程在名為“ PANEL_STATUS_2”的第二個表中進行匯總。 但是，由於數據的性質，我必須編寫一個case語句，以便正確匯總FLEX_PANEL_INSPECTIONS中的數據。 因此，我創建了第三個中間表來橋接兩者（稱為“ PANEL_STATUS_1”），因為case語句不允許group by子句中的列專門對數據進行排序（據我所知-當出現以下情況時，我會報錯）我嘗試執行此操作）。 我不想在中間表中存儲數據-有什么方法可以使它臨時化（即僅在過程運行時才存在，以便不保留“ PANEL_STATUS_1”中的數據）； 在過程中創建視圖，還是完全不需要中間表？

對於我對PL / SQL的錯誤/誤解的任何幫助或批評將不勝感激。 這是我編寫的代碼：

create or replace procedure PANEL_STATUS_PROCEDURE (panel_lot_id in number) as

begin

--Populate intermediate table with information about the status of the panels.
insert into PANEL_STATUS_1 (FLEX_LOT_ID, FLEX_PANEL_DMX, FLEX_PANEL_STATUS)   
select FLEX_LOT_ID, FLEX_PANEL_DMX,

--Sum the status values of the 4 panel inspections. A panel passes if and only if this sum = 4. 
case sum (FLEX_PANEL_STATUS)
    when 4 then 1
    else 0

end as new_panel_status

from FLEX_PANEL_INSPECTIONS
where FLEX_LOT_ID = panel_lot_id
group by FLEX_LOT_ID, FLEX_PANEL_DMX;

--Add information about the machine ID and the upload time to this table.
insert into PANEL_STATUS_2 (FLEX_LOT_ID, FLEX_PANEL_DMX, FLEX_PANEL_STATUS, MACHINE_ID, UPLOAD_TIME)
select distinct PANEL_STATUS_1.*, MACHINE_ID, UPLOAD_TIME
from PANEL_STATUS_1, FLEX_PANEL_INSPECTIONS

where (FLEX_PANEL_INSPECTIONS.FLEX_LOT_ID = PANEL_STATUS_1.FLEX_LOT_ID
       and FLEX_PANEL_INSPECTIONS.FLEX_PANEL_DMX = PANEL_STATUS_1.FLEX_PANEL_DMX)

and FLEX_PANEL_INSPECTIONS.FLEX_LOT_ID = panel_lot_id;

end PANEL_STATUS_PROCEDURE;
/

Answer 1

您可以將臨時表創建為

create global temporary table gtt_panel_status
( column datatype ... )
on commit [delete|preserve] rows;

（在on commit子句中指定delete還是preserve ）。

但是，您通常不需要臨時表。 您可以嘗試with子句（CTE），也可以沿select x, y, z from (select your subquery here)行的內聯視圖select x, y, z from (select your subquery here) 。

編輯：實際上更多地看您的查詢，我認為您實際需要的是一個分析sum ，即沒有匯總的總和。 例如，如下所示：

create or replace procedure panel_status_procedure
    ( panel_lot_id in number )
as
begin
    -- Add information about the machine ID and the upload time to this table.
    insert into panel_status_2
         ( flex_lot_id
         , flex_panel_dmx
         , flex_panel_status
         , machine_id
         , upload_time )
    select distinct
           flex_lot_id
         , flex_panel_dmx
         , case sum(flex_panel_status) over (partition by flex_lot_id, flex_panel_dmx)
               when 4 then 1
               else 0
           end
         , machine_id
         , upload_time
    from   flex_panel_inspections pi
    where  pi.flex_lot_id = panel_lot_id;

end panel_status_procedure;