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SQL 2000 -  Query help

Posted on 2014-01-28
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Last Modified: 2014-01-28
SQL 2000 - I need to write a update query that will take the input date time value:


1. If the DateTime value is between 12.00 AM to 3.00 AM then set the date to previous day with time 12.59.59 PM.

how to write an Update query selecting from another query?

Soemthing like this:
update Table1
select datetime from Table1

Thanks
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Question by:mani_sai
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10 Comments
 
LVL 40

Expert Comment

by:Kyle Abrahams
ID: 39815891
update <table>
set dateTimer = dateadd(d, -1, dateTimer)
where
datepart(hh,datetimer) between 0 and 2 or
(datepart(hh,datetimer) = 3 and datepart(mi, datetimer) = 0)
0
 
LVL 4

Expert Comment

by:ravikantninave
ID: 39815901
update TestTable set mdate = (Select Case When DATEPART(HOUR, AppMstDOJ ) >=0 and DATEPART(HOUR, AppMstDOJ ) <=3 then CAST(CAST(CONVERT(DATE, AppMstDOJ ,101) AS VARCHAR) + ' 12' + ':' +  '59' + ':' + '59' AS DATETIME) else AppMstDOJ  end from AppMast where AppMstID = 272)

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0
 
LVL 8

Author Comment

by:mani_sai
ID: 39815905
Thanks.

Date is moved to previous date , I also want Time portion to be set 23:59:59...

any Idea?

Thanks
0
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LVL 40

Accepted Solution

by:
Kyle Abrahams earned 2000 total points
ID: 39815906
update <table>
set dateTimer = cast(LEFT(CONVERT(nvarchar, DATEADD(DAY, -1, dateTimer), 120), 11) + '23:59:59' as datetime)where
datepart(hh,datetimer) between 0 and 2 or
(datepart(hh,datetimer) = 3 and datepart(mi, datetimer) = 0)

If you already ran the first update just don't do the dateadd again:

update <table>
set dateTimer = cast(LEFT(CONVERT(nvarchar, dateTimer, 120), 11) + '23:59:59' as datetime)where
datepart(hh,datetimer) between 0 and 2 or
(datepart(hh,datetimer) = 3 and datepart(mi, datetimer) = 0)
0
 
LVL 4

Expert Comment

by:ravikantninave
ID: 39815915
update TestTable set mdate = (Select Case When DATEPART(HOUR, AppMstDOJ ) >=0 and DATEPART(HOUR, AppMstDOJ ) <=3 then CAST(CAST(CONVERT(DATE, DATEADD(DAY, -1, AppMstDOJ ),101) AS VARCHAR) + ' 23' + ':' +  '59' + ':' + '59' AS DATETIME) else AppMstDOJ  end from AppMast where AppMstID = 272)

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0
 
LVL 11

Expert Comment

by:John_Vidmar
ID: 39815925
update Table1
set datetimefield = convert(varchar,dateadd(day,-1,datetimefield), 101) + ' 12:59:59 PM'
where convert(varchar,datetimefield,24) between '00:00:00' and '03:00:00'

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0
 
LVL 18

Expert Comment

by:UnifiedIS
ID: 39815927
23:59.59 is easer than 12:59.59
Is it really 3 AM  or < 3 AM?

Just strip the time and subtract one second
UPDATE table
SEt yourdtm = DATEADD(second, -1, CONVERT(varchar(10), yourdtm, 101))
WHERE DATEPART(Hour, yourdtm) BETWEEN 0 AND 2
OR
DATEPART(Hour, yourdtm) = 3 AND DATEPART(minute, yourtdtm) = 0
0
 
LVL 8

Author Comment

by:mani_sai
ID: 39816143
Kyle Abrahams:

Further down my calculation...

I want to strip off the  time portion and update the same date column with just date...



Thanks to everyone for the suggestions.
0
 
LVL 8

Author Comment

by:mani_sai
ID: 39816170
I want to do update for the remaining records...

other than

where
datepart(hh,datetimer) between 0 and 2 or
(datepart(hh,datetimer) = 3 and datepart(mi, datetimer) = 0)
0
 
LVL 8

Author Closing Comment

by:mani_sai
ID: 39816203
Thanks
0

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