[英]SQL how to apply DateDiff for two different where clauses
This is my current query: 这是我当前的查询:
select serial_number, order_number,
(select TOP 1 PRODUCT_ID from PS_ORD_LINE PL
where PL.ORDER_NO = WO.order_number
and CAT_DESCR = 'SYSTEM' and ORD_LINE_STATUS = 'O'
ORDER BY ORDER_INT_LINE_NO) as model,
(select datediff(minute, min(complete_time), min(start_time))
from TRACKED_OBJECT_HISTORY TOH1
where TOH1.op_name IN ('Assembly', 'Pre-Final')
and TOH1.tobj_key = TOH.tobj_key) as waiting_time1,
from UNIT U
left join WORK_ORDER WO on U.order_key = WO.order_key
left join TRACKED_OBJECT_HISTORY TOH on TOH.tobj_key = U.unit_key
where WO.creation_time > '5/1/12' and WO.creation_time < '7/31/12'
group by serial_number, order_number, tobj_key
The part in the middle with DateDiff
is my problem. DateDiff
中间的部分是我的问题。
So Assembly
and Pre-Final
are the names of two different stations that units are scanned in. Assembly
is usually first in line, followed immediately by Pre-Final
. 因此,
Assembly
和Pre-Final
是台扫描两种不同的站名。 Assembly
通常是在第一线,紧接着Pre-Final
。
What I'm trying to do is to calculate the elapsed time after a unit scans out of Assembly
and before that unit scans into Pre-Final
. 我要做的是计算从单元扫描出
Assembly
到该单元扫描到Pre-Final
之前的经过时间。 complete_time
marks when a unit is scanned out of a station, and start_time
is when it's scanned in. complete_time
标记何时将单元从工作站中扫描出, start_time
表示其被扫描时。
Right now, my query doesn't work because both start_time
and complete_time
refer to Assembly
because it's the first station. 现在,我的查询不起作用,因为
start_time
和complete_time
引用Assembly
因为它是第一站。 However, I want complete_time
to refer to Assembly
while I want start_time
to refer to Pre-Final
. 但是,我希望
complete_time
引用Assembly
而我希望start_time
引用Pre-Final
。
How should I go about doing this? 我应该怎么做呢?
Perhaps using 也许使用
DATEDIFF(MINUTE,
(SELECT MIN(complete_time)
FROM TRACKED_OBJECT_HISTORY toh1
WHERE toh1.op_name = 'Pre-Final' AND toh1.tobj_key = toh.tobj_key),
(SELECT MIN(start_time)
FROM TRACKED_OBJECT_HISTORY toh2
WHERE toh2.op_name = 'Assembly' AND toh2.tobj_key = toh.tobj_key)
) AS waiting_time1,
etc. 等等
I don't completely understand your database structure, but if you should be able to use subqueries to pull the two times for each item. 我不完全了解您的数据库结构,但是如果您应该能够使用子查询为每个项目提取两次。 Here's a sample of what the code would look like, assuming that tobj_key refers to an object and each object only goes through the machines once.
这是代码示例的示例,假设tobj_key引用一个对象,并且每个对象仅通过计算机一次。
SELECT
DateDiff(n,AssemblyTime,PrefinalTime)
FROM (
SELECT
tobj_key,
complete_time AS 'AssemblyTime'
FROM TRACKED_OBJECT_HISTORY
WHERE op_name = 'Assembly'
) AS sub1
JOIN (
SELECT
tobj_key,
start_time AS 'PrefinalTime'
FROM TRACKED_OBJECT_HISTORY
WHERE op_name = 'Assembly'
) AS sub2 ON sub1.tobj_key = sub2.robj_key
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