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datetime diff query syntax

P: n/a
Hi.
I'm trying but not getting correct results.

I have two tables
one with app, msg, time
(varchar,datetime,varchar)

app1 start 2006-04-03 13:33:36.000
app1 stuff 2006-04-03 13:33:36.000
app1 end 2006-04-03 13:33:36.000
app1 start 2006-04-03 13:33:36.000
app2 start 2006-04-03 13:33:36.000
app2 stuff 2006-04-03 13:33:36.000
app2 end 2006-04-03 13:33:36.000
app2 start 2006-04-03 13:33:36.000
app3 start 2006-04-03 13:33:36.000
app2 end 2006-04-03 13:33:36.000
app2 start 2006-04-03 13:33:36.000
app2 end 2006-04-03 13:33:36.000
app2 start 2006-04-03 13:33:36.000
app2 end 2006-04-03 13:33:36.000
app3 end 2006-04-03 13:33:36.000
app1 end 2006-04-03 13:33:36.000

and another with dr watson crash info
(varchar, datetime)
app1 2006-04-03 13:33:36.000
app2 2006-04-03 13:33:36.000
app1 2006-04-03 13:33:36.000
app1 2006-04-03 13:33:36.000
app3 2006-04-03 13:33:36.000
I'm trying to make a query that will allow
me to see what entries in the first table
occurred wtihin, say, a minute, or maybe 40
seconds of any of the entries in the second
table.

I want all the entries in the second table to
be present, so I know it has to be some sort
of join, probably an outer join.

my syntax is giving me bad results, probably
because I'm just out of practice.

can someone tell me how to put a query together
so I see the data I'm looking for?
Thanks
Jeff
Jeff Kish
Apr 5 '06 #1
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3 Replies


P: n/a
Jeff Kish wrote:
Hi.
I'm trying but not getting correct results.

(snip)

There are a couple of different ways to do this. This one may not be
the best. It's just the first thing that popped into my mind. Hope it
helps. Your sample data was all the same timestamp. I created sample
data where a crash occurs within one minute of an entry for app1 and
another crash within a minute of an entry for app3. App2 is output in
the results becuase you specifically requested that.

Christopher Secord

create table AppMessage (
App char(4),
MsgType char(5),
MsgDate datetime
)
create table DRWatsonCrash (
App char(4),
CrashDate datetime
)

insert AppMessage values ('app1','start','2006-04-03 13:33:36.000')
insert AppMessage values ('app1','stuff','2006-04-03 13:43:36.000')
insert AppMessage values ('app1','end','2006-04-03 13:53:36.000')
insert AppMessage values ('app2','start','2006-04-04 13:33:36.000')
insert AppMessage values ('app2','stuff','2006-04-05 13:33:36.000')
insert AppMessage values ('app2','end','2006-04-06 13:33:36.000')
insert AppMessage values ('app3','start','2006-04-06 13:43:36.000')
insert AppMessage values ('app3','end','2006-04-06 13:44:36.000')

insert DRWatsonCrash values ('app1','2006-04-03 13:42:56.000')
insert DRWatsonCrash values ('app2','2006-04-03 13:33:36.000')
insert DRWatsonCrash values ('app3','2006-04-06 13:43:56.000')
select AppMessage.App as Application, MsgType, MsgDate
from AppMessage, DrWatsonCrash
where AppMessage.App = DRWatsonCrash.App
and CrashDate between dateadd(minute,-1,MsgDate) and
dateadd(minute,1,MsgDate)
union all
select App as Application, 'DRWatsonCrash', CrashDate as MsgDate
from DRWatsonCrash
order by Application, MsgDate

Apr 5 '06 #2

P: n/a
Jeff Kish (je*******@mro.com) writes:
I have two tables
one with app, msg, time
(varchar,datetime,varchar)

app1 start 2006-04-03 13:33:36.000
app1 stuff 2006-04-03 13:33:36.000
app1 end 2006-04-03 13:33:36.000

and another with dr watson crash info
(varchar, datetime)
app1 2006-04-03 13:33:36.000
app2 2006-04-03 13:33:36.000
app1 2006-04-03 13:33:36.000
app1 2006-04-03 13:33:36.000
app3 2006-04-03 13:33:36.000
I'm trying to make a query that will allow
me to see what entries in the first table
occurred wtihin, say, a minute, or maybe 40
seconds of any of the entries in the second
table.

I want all the entries in the second table to
be present, so I know it has to be some sort
of join, probably an outer join.


There is a standard recommendation for this sort of posts, and that is
that you post:

o CREATE TABLE statments for your tables.
o INSERT statements with sample data.
o The desired output given the sample.

This makes it very easy to copy and paste into a query tool to develop a
tested solution.

With the information you have given, I can only give a non-tested solution,
which is also is just a guess of what you are looking for.

SELECT w.app1, w.datetimecol, o.event, o.datetimecol
FROM drwatson w
LEFT JOIN othertable o
ON w.app = o.app
AND abs(datediff(ss, w.datetimecol, o.datetime.col)) <= 40
--
Erland Sommarskog, SQL Server MVP, es****@sommarskog.se

Books Online for SQL Server 2005 at
http://www.microsoft.com/technet/pro...ads/books.mspx
Books Online for SQL Server 2000 at
http://www.microsoft.com/sql/prodinf...ons/books.mspx
Apr 5 '06 #3

P: n/a
On Wed, 5 Apr 2006 21:42:37 +0000 (UTC), Erland Sommarskog
<es****@sommarskog.se> wrote:
Jeff Kish (je*******@mro.com) writes:
I have two tables
<snip>
There is a standard recommendation for this sort of posts, and that is
that you post:

o CREATE TABLE statments for your tables.
o INSERT statements with sample data.
o The desired output given the sample.

This makes it very easy to copy and paste into a query tool to develop a
tested solution.
I understand. I'll remember this in the future.With the information you have given, I can only give a non-tested solution,
which is also is just a guess of what you are looking for.

SELECT w.app1, w.datetimecol, o.event, o.datetimecol
FROM drwatson w
LEFT JOIN othertable o
ON w.app = o.app
AND abs(datediff(ss, w.datetimecol, o.datetime.col)) <= 40
and also the other message reply said...
There are a couple of different ways to do this. This one may not be
the best. It's just the first thing that popped into my mind. Hope it
helps. Your sample data was all the same timestamp. I created sample Yes, I was in a hurry and was careless. Normally the data is very
much just as you thought below.data where a crash occurs within one minute of an entry for app1 and
another crash within a minute of an entry for app3. App2 is output in
the results becuase you specifically requested that.

Christopher Secord

create table AppMessage (
App char(4),
MsgType char(5),
MsgDate datetime
)
create table DRWatsonCrash (
App char(4),
CrashDate datetime
)

insert AppMessage values ('app1','start','2006-04-03 13:33:36.000')
insert AppMessage values ('app1','stuff','2006-04-03 13:43:36.000')
insert AppMessage values ('app1','end','2006-04-03 13:53:36.000')
insert AppMessage values ('app2','start','2006-04-04 13:33:36.000')
insert AppMessage values ('app2','stuff','2006-04-05 13:33:36.000')
insert AppMessage values ('app2','end','2006-04-06 13:33:36.000')
insert AppMessage values ('app3','start','2006-04-06 13:43:36.000')
insert AppMessage values ('app3','end','2006-04-06 13:44:36.000')

insert DRWatsonCrash values ('app1','2006-04-03 13:42:56.000')
insert DRWatsonCrash values ('app2','2006-04-03 13:33:36.000')
insert DRWatsonCrash values ('app3','2006-04-06 13:43:56.000')
select AppMessage.App as Application, MsgType, MsgDate
from AppMessage, DrWatsonCrash
where AppMessage.App = DRWatsonCrash.App
and CrashDate between dateadd(minute,-1,MsgDate) and
dateadd(minute,1,MsgDate)
union all
select App as Application, 'DRWatsonCrash', CrashDate as MsgDate
from DRWatsonCrash
order by Application, MsgDate


Thanks much. I'll try both solutions.
I appreciate the feedback.
Jeff
Apr 6 '06 #4

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