I am new to SQL statements and I am having a little trouble getting data from a week ago based on the date modified.
SELECT People.first, People.last, company.companyname, People.lastmodified
FROM job_prof
INNER JOIN People ON job_prof.cid = People.cid
INNER JOIN company ON job_prof.Id = company.id
-> WHERE People.lastmodified = DATE(DATE_ADD(GETDATE(), INTERVAL -7 DAY))
ORDER BY People.lastmodified DESC";
Example of Date in the table is 6/9/2011 12:08:01 PM
Any suggestions will be helpful.
Thank you
WHERE DATEDIFF(day, People.lastmodified, GETDATE()) <= 7
The trick with dates is to create a range first with DATEADD and whatever else you need, I.e.
declare #start datetime = ...,
#end datetime = ...
Then search in that range; I typically include the start and exclude the end, as this allows a simple "data between the 10th and 12th"
where row.lastmodified >= #start
and row.lastmodified < #end
Having a range is critical unless the values are entire units (days, etc) - otherwise equality won't work very well. And the simple >= and < use allows effective use of indexing etc.
If it's a range you're looking for, such as anything modified starting a week ago and ending a week before that, BETWEEN makes this pretty easy.
WHERE People.lastmodified BETWEEN DATEADD(week, -1, getdate()) AND DATEADD(week, -2, getdate())
Related
I have 3 time(0) column in 1 row. I want to calculate arrival-Time column automatically and this is result of the sum of Departure-Time + Duration
Departure-Time= 14:30:00
Duration: = 02:45:00
Arrival must be = 17:15:00
is it possible with trigger or computed area method? thanks in advance
SQL Server does not support direct addition on time values; however, you can use datediff against 0 to find how many (of some interval - minutes, seconds, etc; choice depends on your required precision) to calculate the duration, and then dateadd the same:
declare #start time= '14:30:00', #duration time = '02:45:00';
declare #end time = dateadd(second, datediff(second, 0, #duration), #start);
select #end; -- 17:15:00.0000000
CREATE TABLE #SomeTimes
(
Departure TIME,
Duration TIME
)
INSERT INTO #SomeTimes
VALUES ('14:30:00', '02:45:00')
SELECT Departure, Duration, DATEADD(MINUTE, DATEDIFF(MINUTE, 0, Duration) , Departure)
FROM #SomeTimes
Your data is in a table. You can add a computed column to the table so the arrival time is always calculated correctly:
alter table t add column arrival_time as
(convert(time, convert(datetime, departure_time) + convert(datetime, duration));
This way, the value is always correct when you query the table.
Note: For some inexplicable reason, SQL Server allows you to add datetime values, but not time values (and other combinations). This also works across midnight, so 23:00:00 + 02:00:00 is 01:00:00, rather than generating an error.
I'm sharing an easy way solution for my case. You can follow the pictures. Thanks everyone.
It's not possible to directly SUM a Time Column. However, if you want to SUM up a duration across rows i.e. a Time(7) data type you can convert the time to seconds (or milliseconds), do the sum and then convert back to a Time.
CAST(DATEADD(SECOND, SUM(DATEDIFF(SECOND, '1900-01-01', CAST(YOUR_DURATION_TIME_COLUMN AS DATETIMEOFFSET))), 0) AS TIME(7))
CAST(DATEADD(MILLISECOND, SUM(DATEDIFF(MILLISECOND, '1900-01-01', CAST(YOUR_DURATION_TIME_COLUMN AS DATETIMEOFFSET))), 0) AS TIME(7))
I'm creating an ASP.NET application (C#), I'm nearly finished however I have the following question.
Scenario
In my MSSQL table I have a datetime value i.e. 2015-05-06 13:38:17.000 I need to find out if this is over 6 hours old but I need to take into account the fact we are only working from 8:30-18:00 Monday to Friday.
I currently work out if an item is over 4 hours old (not taking working hours into account) using the following query:
SELECT COUNT(*) FROM Table WHERE [DateSubmitted] < DATEADD(HOUR,-4,GETDATE())
I've read up on how to calculate the working hours: Calculate business hours between two dates but I don't know how to apply this to what I want to do.
Any help would be appreciated - thank you.
Just get the max date within business hour and do your query with that parameter
DECLARE #EndDate DATETIME, #StartBusinessDay DATETIME, #YesterdayEndBusinessDay DATETIME,#Interval DECIMAL(10,2)
SET #Interval=4*3600*-1
--set start period of business hour
--you can change hard coded date to variable one
SELECT #StartBusinessDay=CAST('2015-06-17 08:00:00' AS datetime),
#YesterdayEndBusinessDay =CAST('2015-06-16 17:00:00' AS datetime)
--get maximal date with basic calculation
SELECT #EndDate=DATEADD(ss,#Interval, GETDATE())
--if max date is not within business hour, do this
IF(#EndDate<#StartBusinessDay)
BEGIN
DECLARE #Difference DECIMAL(4,2)
--get the difference between result of basic calculation and start business hour
SELECT #Difference=DATEDIFF(ss, #EndDate, #StartBusinessDay)
--subtract it with initial interval
SET #Difference=#Interval-#Difference;
--get the new max date within business hour
SELECT #EndDate=DATEADD(ss,#Difference,#YesterdayEndBusinessDay)
SELECT #EndDate
END
--query with max date within business hour
SELECT COUNT(1) FROM Table
WHERE [DateSubmitted] < #EndDate
I am trying to pass a SQL query through c# , currently it is based on just the day month and year with time always set to 0 EG 1997-10-28 00.00.00.000 which is great as the time never changes it easy for me to just Select Where date equals the calendar date.
However with the Start Field , the time is different on each record , eg 1899-12-30 14.14:00.00.000 , 1899-12-30 15.14:30.00.000 . (Seconds downwards are always the same) .
So I need to have a query that will return all the results of the selected date on the "Start" field . How would I do this?.
E.G IF i click the calendar which passes 1997-10-28 00.00.00.000 , I would like the results of every time in that day!. How do I go about that?.
Thanks for any input.
EDIT: Is there a way to format the date that i have in SQL ?. This comes from an old access database!. and as you can see above it is 1899-12-30 ?. not 1998 , I don't know why this has happened!.
WHERE DATEDIFF(dd, your_start_field, #your_param) = 0
You need to select all record between today and tomorrow without including tomorrow's date.
WHERE EventDate >= StartDate AND EventDate < DATEADD(d, 1, StartDate)
Can you not just query the date part. I think this should work...
SELECT * FROM Table1 WHERE StartDate = '1997-10-28'
EDIT: Above may not work but following should cover needs
SELECT * FROM Table1 WHERE StartDate >= '1997-10-28 00:00:00.000' AND StartDate < '1997-10-29 00:00:00.000'
(notice the second date is the following date)
This SQL DATEADD(d,datediff(d,0,startdate),startdate) will convert a date with time to just the date;
eg
Select field1,field2 from mytable where DATEADD(d,datediff(d,0,startdate),startdate)='1997-10-28'
I am a little confused about how or what the best way to determine what the closest date is to DateTime.Now is.
In my table, everything needs to be timestamped. And on a page, I need to be able to retrieve everything from the table only if the date is the closest date to now.
How would I go about this?
I am using DateTime.Now when inserting dates into the Database, and the format is like:
5/07/2011 5:28:57 PM
Here's my suggestion:
declare #DateTimeNow datetime = getdate()
select TOP (1)
RecordId
,MyDateColumn
,abs(datediff(s, MyDateColumn, #DateTimeNow)) as Diff
from
MyTable
order by
abs(datediff(s, MyDateColumn, #DateTimeNow)) asc
Do not forget to use ABS()!
How about
SELECT TOP 1 *
FROM MyTable
ORDER BY TimestampColumn DESC
Consider storing time in UTC - DateTime.UtcNow
In T-SQL you could use DateDiff:
DATEDIFF ( datepart , startdate , enddate )
http://msdn.microsoft.com/en-us/library/ms189794.aspx
or in C# you could use TimeSpan:
http://msdn.microsoft.com/en-us/library/system.timespan.aspx#Y3719
Do you only have past dates, meaning, will you ever have a date that is newer than DateTime.Now? If not, you could get by with a simple Order By on the date column selecting the newest date. Otherwise, you'll need to get a date difference between your DateTime.Now, and order by that result. e.g.
SELECT TOP 1
columnDate
FROM table1
ORDER BY DATEDIFF (ss,#passedInDate,columnDate)
This would essentially look for all future and past dates using your #passedInDate (DateTime.Now) as the qualifier or base date. I'm using seconds as the time interval to compare in my example, but you can change that to whatever makes the most sense for you.
Also, you shouldn't need to pass in DateTime.Now to SQL server, as you can use the built in GetDate() function.
Something like this should work:
SELECT TOP 1 * FROM MyTable ORDER BY ABS(DATEDIFF(DD, getdate(), DATE))
This should sort your rows by the closest date, past or future. If you need it more precise then just days, change DD to something else, as specified here
I've been working on this for the past few days and I can't find my way out of it. I have a C# web application that needs to print reports on screen. This same application calls a stored procedure on the database (Oracle) and it returns a cursor. Here is the procedure
PROCEDURE report_total(beginDate IN DATE, endDate IN DATE, c OUT REF CURSOR)
AS
BEGIN
OPEN
c
FOR
SELECT
month
,sum(field1)
-- + a lot of other fields
FROM
view1 v
WHERE
beginDate <= v.date
AND v.Date < endDate
GROUP BY
month
END;
This works fine, it gives me the sum of field1 (and others) per months. Assuming you enter, at least, a complete year range you'll get, at most, 12 rows. Howhever. I would like to make something a similar stored procedure that would give me the detail of these months.
Let's say beginDate = '2003-01-01' and the endDate = '2005-01-05' (YYYY-MM-DD), I would need 25 rows. One per month, per year. And I would like to get these results with the cursor OUT. If you have a simplest idea that wouldn't involve a cursor please suggest me.
SELECT TRUNC(v.date, 'MONTH'), SUM(field1)
FROM view1 v
WHERE v.date BETWEEN beginDate and endDate
GROUP BY
TRUNC(v.date, 'MONTH')