Question

我是PL / SQL的新手。我在初始表中有数据，名为'FLEX_PANEL_INSPECTIONS'，我试图在第二个表中汇总，使用PL / SQL过程命名为'PANEL_STATUS_2'。但是，由于数据的性质，我必须编写一个case语句才能正确汇总FLEX_PANEL_INSPECTIONS中的数据。因此我创建了一个第三个中间表来桥接这两个（名为'PANEL_STATUS_1'），因为case语句不允许group by子句中的列专门对数据进行排序（据我所知 - 我得到一个错误我试着这样做）。我不想将数据存储在中间表中 - 有什么方法可以使它成为临时的（即仅在程序运行时存在，以便不保留来自'PANEL_STATUS_1'的数据）;在过程中创建一个视图，或者完全不需要中间表？

对我的错误/对PL / SQL的误解的任何帮助或批评将不胜感激。这是我写的代码：

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

您可以将临时表创建为

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

（在delete子句中指定preserve或on commit。

但是你通常不需要临时表。您可以尝试with子句（CTE），或沿select x, y, z from (select your subquery here)行的内联视图。

编辑：实际上更多地查看您的查询，我认为您实际需要的是分析sum，即没有聚合的总计。例如，像这样：

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;

我应该如何在PL / SQL过程中临时存储数据？

1 个答案: