Please start any new threads on our new site at https://forums.sqlteam.com. We've got lots of great SQL Server experts to answer whatever question you can come up with.

 All Forums
 General SQL Server Forums
 New to SQL Server Programming
 SQL Calculate Average time spend based on a change

Author  Topic 

azoo123
Starting Member

2 Posts

Posted - 2013-02-15 : 13:41:48
I have a table similiar to

create table LOCHIST
(
RES_ID VARCHAR(10) NOT NULL,
LOC_DATE TIMESTAMP NOT NULL,
LOC_ZONE VARCHAR(10)
)with values such as

insert into LOCHIST values(0911,2015-09-2312:27:00.000000,SYLVSYLGA);
insert into LOCHIST values(5468,2013-02-15 13:13:24.000000,30726);
insert into LOCHIST values(23894,2013-02-15 13:12:13.000000,BECTFOUNC);
insert into LOCHIST values(24119,2013-02-15 13:12:09.000000,30363);
insert into LOCHIST values(7101,2013-02-15 13:11:37.000000,37711);
insert into LOCHIST values(26083,2013-02-15 13:11:36.000000,SHAWANDAL);
insert into LOCHIST values(24978,2013-02-15 13:11:36.000000,38132);
insert into LOCHIST values(26696,2013-02-15 13:11:27.000000,29583);
insert into LOCHIST values(5468,2013-02-15 13:11:00.000000,37760);
insert into LOCHIST values(5552,2013-02-15 13:10:55.000000,30090);
insert into LOCHIST values(24932,2013-02-15 13:10:48.000000,JBTTLITGA);
insert into LOCHIST values(23894,2013-02-15 13:10:42.000000,47263);
insert into LOCHIST values(26803,2013-02-15 13:10:25.000000,32534);
insert into LOCHIST values(24434,2013-02-15 13:10:03.000000,PLANSUFVA);
insert into LOCHIST values(26696,2013-02-15 13:10:00.000000,GEORALBGA);
insert into LOCHIST values(5468,2013-02-15 13:09:54.000000,19507);
insert into LOCHIST values(23894,2013-02-15 13:09:48.000000,37725);

This table literally goes on for millions of records.

Each RES_ID represents the ID of a trailer who pings their location to a LOC_ZONE which is then stored at the time in LOC_DATE.

What I am trying to find, is the average amount of time spent for all trailers in a specific location zone. For example, if trailer x spent 4 hours in in loc zone PLANSUFVA, and trailer y spent 6 hours in loc zone PLANSUFVA I would want to return

Loc Zone Avg Time
PLANSUFVA 5

Is there anyway to do this without cursors?

I really appreciate your help.

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2013-02-15 : 14:25:45
yep
you can do like


SELECT l1.LOC_ZONE,AVG(DATEDIFF(hh,l1.LOC_DATE,COALESCE(l2.MinDate,GETDATE()))*1.0) AS timeDiff
FROM LOCHIST l1
OUTER APPLY (SELECT MIN(LOC_DATE) AS MinDate
FROM LOCHIST
WHERE RES_ID = l1.RES_ID
AND LOC_DATE > l1.LOC_DATE
AND LOC_ZONE <> l1.LOC_ZONE
)l2
GROUP BY l1.LOC_ZONE


------------------------------------------------------------------------------------------------------
SQL Server MVP
http://visakhm.blogspot.com/

Go to Top of Page
   

- Advertisement -