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SQL Date query to calculate the day before

Posted on 2007-04-04
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Last Modified: 2008-01-09
Dear Experts,
I would like to schedule the following query to be run on a daily (morning) bases rather then me running it manually, but what I would like it to do is calculate the date back to yesterday.
SELECT     COUNT(DISTINCT SOURCE_IP) AS [IP ADDR]
FROM         INCOMING_VIEW
WHERE     (DATE_TIME > '2007-04-03 00:00:00') AND (DATE_TIME < '2007-04-03 23:59:59')
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Question by:markodenev
4 Comments
 
LVL 10

Expert Comment

by:ksaul
ID: 18855258
SELECT     COUNT(DISTINCT SOURCE_IP) AS [IP ADDR]
FROM         INCOMING_VIEW
WHERE     DAY(DATE_TIME) = DAY(GetDate() - 1)
0
 
LVL 2

Accepted Solution

by:
jhshen earned 2000 total points
ID: 18855296
Here are two ways to do so.
1.
SELECT     COUNT(DISTINCT SOURCE_IP) AS [IP ADDR]
FROM         INCOMING_VIEW
WHERE     (DATE_TIME >= dateadd(day, -1, convert(datetime, convert(varchar, getdate(), 104), 104))) AND (DATE_TIME < convert(datetime, convert(varchar, getdate(), 104), 104))

2.
SELECT     COUNT(DISTINCT SOURCE_IP) AS [IP ADDR]
FROM         INCOMING_VIEW
WHERE     DAY(DATE_TIME) = DAY(GetDate() - 1)
And MONTH(DATE_TIME) = MONTH(GetDate() - 1)
And YEAR(DATE_TIME) = YEAR(GetDate() - 1)
0
 

Author Comment

by:markodenev
ID: 18855589
The two optionts provided by jhshen are the ones that worked correctly, but if I was to perform this to greater then one day back then the only query that gave me the same results as my quary was option 2 from jhshen. So thanks to all that participated.
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LVL 18

Expert Comment

by:chrismc
ID: 18855696
The following will also work, and might be slightly more efficient.
The convert strips the time off the dates and DateAdd takes a day off of todays date. DateAdd is a very useful function.
Code 112 sets dates into ISO mode (yyyymmdd) which is a more compact format for internal calculations of this nature. See the SQL help on Convert for details of date format codes.

SELECT     COUNT(DISTINCT SOURCE_IP) AS [IP ADDR]
    FROM         INCOMING_VIEW
    WHERE     Convert(VarChar(8), DATE_TIME, 112) = Convert(Varchar(8), DateAdd(dd, -1, GetDate(), 112)

Cheers
Chris
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