I am trying to retrieve the record of the next upcoming event, i have used a variety of different methods, but cannot seem to get the result. I need the event that is retrieved to be in the future,
For example if there was an event yesterday and there is one in three weeks time, i would like the record of the one in three weeks time, rather than yesterday.
The statement i have currently is:
SELECT TOP 1 *
FROM Events
WHERE StartDate <= DATEADD(day, DATEDIFF(day,0,getdate()), 0)
ORDER BY StartDate ASC
thanks
SELECT TOP 1 E.*
FROM Events E
WHERE E.StartDate > GetDate()
ORDER BY E.StartDate ASC
http://msdn.microsoft.com/en-us/library/ms188383.aspx
Related
I have a dataset that contains 250,000 rows and is expected to grow at around 100,000 rows a month.
I have data that contains the following columns:
ShiftDate (Day a shift occurred on),
Shift Start Time,
Shift End Time
and Employee Number.
I would like to flag consecutive shifts with a 1 when an Employees Shift End Time was within 4 hours of the start time of their next shift, otherwise flag it with a 0.
my data table
I have tried running a query that joins the table to itself but the run time is too long. I was planning to create the flag based on a case statement using 'NextStart':
select shiftdate,
shiftstarttime,
shiftendtime,
EmployeeID,
(select min(t2.shiftstarttime) from TABLE t2 where t1.EmployeeID=t2.EmployeeID and T2.shiftstarttime > t1.Shiftendtime) as NextStart
from
TABLE t1
I would love to know a more efficient way of trying to do this.
Thanks!
Select shiftdate, shiftstarttime, shiftendtime, employeeid,
(Case when
lead(shiftstarttime, 1) over (partition by employeeid order by shiftdate, shiftstarttime) - shiftendtime < 4 then 1 else 0 end) as consecutive_shift_flag
from table_name
In this query lead() window function is used to get the next shift start time for that employee
lead(shiftstarttime, 1) over (partition by employeeid order by shiftdate, shiftstarttime)
In case this is not what you are looking for then please share the Sample of correct output based on input data for couple of cases.
I am having a SQLite database which contains a table Events with start and end dates. I would like to get a Set (could be an array without duplicates) of dates that they at least have an Event on that day let's say from 1st of August to 20th of August.
Let's take some example events:
Event 1 from 02.08.2016 to 07.08.2016
Event 2 from 10.08.2016 to 12.08.2016
Event 3 from 11.08.2016 to 15.08.2016
Then the outcome should be:
[02.08.2016, 03.08.2016, 04.08.2016, 05.08.2016, 06.08.2016, 07.08.2016, 10.08.2016, 11.08.2016, 12.08.2016, 13.08.2016, 14.08.2016, 15.08.2016]
where 11.08.2016 and 12.08.2016 are not repeating.
NB: I am expecting an answer that could solve this problem only using SQL rather combining some programming code. I need that on a mobile device (iOS) where I am trying to optimize the user experience and performance.
Here is an example of creating a date table with recursive CTE and using it to select dates you need:
WITH RECURSIVE
cnt(dt) AS
(
SELECT MIN(startDate) FROM Events
UNION ALL
SELECT date(dt,'+1 day') FROM cnt
WHERE dt < (SELECT MAX(endDate) FROM Events)
LIMIT 10000
)
SELECT DISTINCT dt
FROM cnt
JOIN Events ON dt BETWEEN startDate AND endDate
ORDER BY dt;
SQL fiddle demo
This is my scenario. I have a table with FirstMaintenanceEventDate and some data repeating after certain days from FirstMaintenanceEventDate. What I need to find out through a SQL Server query is to get the nearest date of each row among them.
Ex: there is a data row FirstMaintenanceEventDate is last month and it will repeat after 40 days which is next month. Likewise there are a lot of events here. Some of them have FirstMaintenanceEventDate in the future. Out of all these items I need to get the nearest date for each row.
I could get the nearest date without considering repeating process.
This is my query
SELECT TOP 1 *
FROM FIS_MaintenanceEventInstance
WHERE VehicleName = '600-GUR'
AND FirstMaintenanceEventDate >= GETDATE()
ORDER BY FirstMaintenanceEventDate ASC
Need to update it to consider repeat events as I describe above. Probably something like this but this isn't correct.
SELECT TOP 1 *
FROM FIS_MaintenanceEventInstance
WHERE
VehicleName = '600-GUR'
AND FirstMaintenanceEventDate >= GETDATE()
AND CASE
WHEN FirstMaintenanceEventDate < GETDATE()
THEN (Getdate() + RecurringDays)
END
ORDER BY FirstMaintenanceEventDate ASC
Any suggestion would be appreciated.
NOTE: If you need more information please let me now.
EDITED
I have tried follow query as Jatin Patel suggested in his answer below.
SELECT TOP 1 *,
CASE WHEN FirstMaintenanceEventDate < GETDATE() THEN DateAdd(day,RecurringDays,FirstMaintenanceEventDate)
ELSE FirstMaintenanceEventDate END AS MaintenanceEventDate
FROM FIS_MaintenanceEventInstance
WHERE VehicleName ='600-GUR'
ORDER BY MaintenanceEventDate ASC
This is not working as expected. After calculate the repeat date (here it's MaintenanceEventDate) also should consider when get the nearest date. According to this query it is calculate repeated date (MaintenanceEventDate) if it is in past and return it without check with other dates in the table.
Try this,
SELECT TOP 1 *,
CASE WHEN FirstMaintenanceEventDate < GETDATE() THEN (Getdate()+RecurringDays) ELSE FirstMaintenanceEventDate END AS MaintenanceEventDate
FROM FIS_MaintenanceEventInstance
WHERE VehicleName ='600-GUR'
ORDER BY MaintenanceEventDate ASC
Can anyone help me create a query which will populate a list of DJs who are not already booked in.
My user will select a start date (and time), and an end date (and time) - and then click a button to select a DJ.
I only want those DJs which are available between those time slots to appear in the list.
Here are the two tables which are involved
all I need in the listbox is the DJ Number, and the DJ Name
So far I have this... but it isn't working:
SELECT tblDJ.DJ_No AS [DJ ID], tblDJ.DJ_Name AS Name FROM tblDJ
WHERE (((tblDJ.[DJ_No]) Not In
(SELECT tblBooking.[FK_DJ_No]
FROM tblBooking
WHERE ( (tblBooking.End_Date) >= 01-04-2020 19:30:00 )))) ....etc....
I'm just entering a date in here for now, but obviously it will be stored in a variable once implemented.
Thanks
Implementing OVERLAPS of two intervals would look like:
1st_start_date <= 2nd_end_date and 1st_end_date >= 2nd_start_date
where 1st and 2nd values are markers of different events.
You could use that logic in combination with NOT EXISTS to discard those djs that are unavailable at a given time:
select dj_no, dj_name
from tbldj d
where not exists (
select 1
from tblbooking b
where b.fk_dj_no = d.dj_no
and b.start_date <= #END DATE#
and b.end_date >= #START DATE#
)
You just need to replace #START DATE# and #END DATE# with your values.
This does work because there are following assumptions:
Start date of the first event is prior to end date of that event
Start date of the second event is prior to end date of that event
Which seems logical, right?
The date in the SQL needs to be wrapped between two # in order for MS-Access to recognize it as a date:
select *
from tblDJ
where DJ_No not in
(
select FK_DJ_No
from tblBooking
where End_Date >= #2020-04-01 19:30:00#
)
Other than that you query will work.
I'm trying to find a way to display the last event held (last date and time) in an events table whilst displaying all the columns for that event without using ORDER BY.
For example:
SELECT * from Events
where dateheld in (select max(dateheld) from events)
AND starttime in (select max(starttime) from events)
When I put MAX starttime, it displays nothing. When I put MIN starttime it works but displays the earliest time of that date and not the latest.
I guess you could print out your records, throw them down the stairs, and the ones that go farthest have the "lightest" dates. You cannot sort without order by. It's like wanting water that isn't wet. Unless your data naturally comes out in the order you want, you MUST sort.
Of course, if you want only the record that has the absolute most recent date, and don't need more than just that one record, then
SELECT yourdatetimefield, ...
FROM yourtable
HAVING yourdatetimefield = MAX(yourdatetimefield)
If you are only looking for the latest item:
EDIT gets a little more complicated when you have seperate date and time fields, but this should work. This is a ridiculous kludge for a situation where date and time should be stored in one field.
SELECT *
FROM (
SELECT *
FROM Events
WHERE dateTime = (SELECT MAX(dateheld) FROM Events)
) temp
WHERE starttime = (SELECT MAX(starttime) FROM (
SELECT *
FROM Events
WHERE dateTime = (SELECT MAX(dateheld) FROM Events)
) temp 2 )