where I come from:
I have the tables 'event', user and user_event. Table event stores datetimes for start and end of an event. User_event holds information in which event a user is attending. Now it is easy possible to calculate the SUM of time a certain user is scheduled in events by just adding up all event durations.
But I need something different. Assuming that it is monday and user A is attending an event from 9-10am and from 2-3pm. The sum of these events is 2hrs. But I want to calulate how long the presence of a user is to take part in these events. In my example this is 6hr (from 9am - 3pm). I achieved this for one day (with time difference of max(event) and min(event) for the user and a given day.
Where I wanna go:
But I can´t find a solution for the task to sum the presence for the whole week. I need to add up all presence-sums for each day. But I cannot use the solution given for one day because min() and max() will only give me unique min and max values for the whole week and not for each day of the week.
Hope I described it well enough.
Thanks!
Make a GROUP BY on the days first, then on the week:
select
sum(d.dayFinish - d.dayStart) as weeklyPresence,
week(d.day) as weekNumber
d.userId
from (
select
to_date(e.startDate) as day,
min(e.startDate) as dayStart
max(e.finishDate) as dayFinish,
e.userId
from events e
group by to_date(e.startDate), e.userId
) d
group by week(d.day), d.userId
(I did not follow the actual syntax, some type conversions may be needed).
I suppose you have an Events table with startDate and endDate columns, and a userId foreign key that refers to the user.
The to_date() function rounds to the day (we group on that first), and the week() function determines the week (that's our second grouping).
Related
In short: MySQL - I need to bring company that have been inactive for a while (or 365 days for the fiddle example).
How I check this? each company have at least a contact, who is related to an event, and each event have (many) subevents, in this last table I have the last date of activity, the days that considers that one company is on inactivity is decided for the user, I don't have problem to do this calculation
sql.Append("where DATEDIFF(CURDATE(),DATE(lastdate)) > " +days.ToString()+ "
The problem is, that this check ALL the subevents, so this not only check the last date, but every date... and this means, bad output.
I was thinking on subqueries to get or the max date on the subevent of a contact, or the max date of the subevent of a event.
Then with a friend we get close with sort of this, but the query is infinite.
select * from subevent se
where DATEDIFF(CURDATE(),DATE(
(select se2.dates from subevent se2
where se2.dates in
(select max(se3.dates)
from subevent se3
where se.idev = se3.idev)
group by se2.dates)));
I'm stuck and I would appreciate the help...
Tried group by, subquery and MAX (obviously max is necessary, but don't how where to apply...)
https://www.db-fiddle.com/f/wgSQGn7Z26tHnwm6nAaNSA/8
(On the Fiddle link, should only bring the companyname2 and companyname4)
You can use aggregation to get the last subevent date for each company. Then filter using a having clause:
select c.idcomp
from contact c join
events e
on e.idcont = c.idcont join
subevent se
on se.idev = e.idev
group by c.idcomp
having max(se.date) < current_date - interval 365 day;
Here is a db-fiddle.
So I have a row which shows when it was created! (i.e. 12/1/2013), and I have recurring patterns with frequencies associated with it.
Frequencies are from 1 to 6 and Recurring Patterns are Daily, Weekly, Monthly, and Yearly.
So users can set up recurring like {Frequency:1, Recurrence: Monthly} or {Frequency:2, Recurrence: Monthly}
I need a query that will take the current and the created date, and see if current date falls under the frequency.
so if the Created Date: 12/1/2013, and Today: 2/1/2014, the {frequency: 2, Recurrence: Monthly} would be valid.
try this sqlFiddle it uses a function that checks to see if the given date is recurring for each row in schedule
Assuming:
Recurrence has days associated and is stored in the database as daily=1, week=7, month=31, yearly=365
That you want valid or invalid returned
That your dates are in standard mysql date format
Then the below will work:
To get the difference in days between two dates use the DATEDIFF() function
To get the absolute value of an int use the ABS() function
To get the remainder of a dividend and divisor use the MOD() function
Here is some example code:
SELECT
IF(MOD((ABS(DATEDIFF(createdDate,'2014-02-01'))/days),frequency)=0,'valid','invalid') AS result
FROM
schedule
INNER JOIN recurringtypes ON schedule.recurringtypeId=recurringtypes.id
EDITED: SQLFiddle
I have a table with one user and one day's worth of punches (clockin, breakout, breakin, clockout). Now say the user takes 2 or more breaks. I need to sum up the total time of all breaks taken. I have created a sqlfiddle to make it easier to show what I am trying to do. Here is my example: http://sqlfiddle.com/#!2/21542/6 Now I need to take (12:30:21 - 12:04:44) + (12:36:00 - 12:34:00) to get the total of all breaks taken. How can I do that in my query. Now pretend I have 10 users and 10 days in my table. I would need to group by day and user I know.
I would start by finding some way to link the punch-out records with the punch-in records from the same table. We can then put this data into a table and use it for querying against.
CREATE TEMPOARY TABLE breakPunchInOut (
SELECT
DATE(punchout.PunchDateTime) AS ShiftDate,
punchout.EmpId,
punchout.PunchId AS PunchOutID,
(SELECT
PunchId
FROM
timeclock
WHERE
timeclock.EmpId = punchout.EmpId
AND
timeclock.`In-Out` = 1
AND
timeclock.PunchDateTime > punchout.PunchDateTime
AND
DATE(timeclock.PunchDateTime) = DATE(punchout.PunchDateTime)
ORDER BY
timeclock.PunchDateTime ASC
LIMIT 1
) AS PunchInID
FROM
timeclock AS punchout
WHERE
punchout.`In-Out` = 0
HAVING
PunchInID IS NOT NULL
);
The way this query works is looking for all the "punch-outs" in a specific day, for each of these it then looks for the next "punch-in" which happened on the same day, by the same person. The HAVING clause filters out records where there is no punch-in after a punch-out - so maybe where the employee goes home for the day. This is something to remember because if someone goes home halfway through a shift then their break time will not be added to the total.
It's important to point out that this approach will only work for shifts which start and end on the same day. If you have a night shift which starts in the evening and finishes in the morning the next day, then you'll have to alter the way that you join the punch outs and punch ins together.
Now that we have this linking table, its relatively simple to use it to create a summary report for each employee and each shift:
SELECT
breakPunchInOut.ShiftDate,
breakPunchInOut.EmpId,
SUM(
TIMESTAMPDIFF(MINUTE, punchOut.PunchDateTime, punchIn.PunchDateTime)
) AS TotalBreakLengthMins
FROM
breakPunchInOut
INNER JOIN
timeclock AS punchOut
ON
punchOut.PunchId = breakPunchInOut.PunchOutId
INNER JOIN
timeclock AS punchIn
ON
punchIn.PunchId = breakPunchInOut.PunchInId
GROUP BY
breakPunchInOut.ShiftDate,
breakPunchInOut.EmpId
;
Notice we use the TIMESTAMPDIFF function, not the DATEDIFF. DATEDIFF only calculates the number of days between two dates - it's not used for time.
I really don't know how to ask this question or title it but here I go. I work in a school system and I have created a database for some psychologists to use to track their referrals. By state rules,they have 60 days from the date of their first meeting to finish the process. Weekends still count but HOLIDAYS DO NOT. I do not really know how to use the calender we have so that we have an accurate Calculation. For instance, with Holidays accounted for, if a kid was started today, he would need to have everything finished on 1/18/2013 That is 60 days from now based on our schedule. Does anyone have any idea where I should start?
Edit
Ok, so I now have a Calender table. Here is my issue. I have my column that I used to indicate which days are used in calculating my 60 days. Weekends can be used in that calculation. HOWEVER, they cannot be used in the result. If the 60th day lies on a Sunday or Saturday, then the date would need to go to the Friday before. I guess my first issue is really, how do I limit my calculation to the dates in my calender table?
This can be easy with a calendar table.
PARAMETERS start_date DateTime;
SELECT TOP 1 sub.the_date
FROM
(
SELECT TOP 60 the_date
FROM tblCalendar
WHERE
the_date>=[start_date]
AND work_day=True
ORDER BY the_date
) AS sub
ORDER BY sub.the_date DESC;
That query is based on the assumption you have set work_day to True for the dates you want evaluated. IOW, work_day will be False only for your organization's holidays.
For sample code to create and load your calendar table, see the CreateTable_calendar() and LoadCalendar() procedures at Using Start Date and End date in Access query. To initially assign all dates including weekend days as work days, make this change in LoadCalendar().
'rs!work_day = Not (Weekday(dte) = vbSunday Or _
' Weekday(dte) = vbSaturday)
rs!work_day = True
Finally, manually edit the table to change work_day to False for your holidays.
You can check the weekday to ensure you have not chosen a weekend:
SELECT TOP 1 CalDate, WDay
FROM (SELECT Top 60 c.CalDate,Weekday([Caldate]) AS WDay
FROM Calendar c
WHERE c.Holiday=False) a
WHERE WDay Not In (1,7)
ORDER BY CalDate DESC
I have several rows in a table, each containing a start date and an end date. The user has a checkbox for each month of the year. I need to determine which rows contain a date range that includes any of the user's chosen months.
It's easy to check the start & end months by, for example, MONTH(start_date) IN ($month_list), but this approach won't match any months between the two dates.
So I suppose what I'm asking is: is there a way of obtaining the inclusive months from a date range purely in SQL?
I assume you would want to include data rows where the date range spans or intersects with the selected periods - in which case, I'd shove the user selected periods into a table and do a fuzzy join, something like.....
SELECT DISTINCT at.*
FROM a_table at, user_periods up
WHERE at.start_date<=up.end_date
AND at.end_date>=up.start_date
AND up.trans_id=$SOME_VAR
(the trans_id just allows the table to be used for multiple operations)
To minimise the effort here, the user_periods table should have an index on start_date and end_date, and similar for a_table.
Can something like this help?
WHERE
MONTH(start_date) < MONTH_YOU_ARE_CHECKING and
MONTH() > MONTH_YOU_ARE_CHECKING
If you need to check all at once you can do a list of all the months and after delete from the list the month that the user choose, and after compare against the list. It will be better with a pseudocode example :)
MONTHS = 1,2,3,4,5,6,7,8,9,10,11,12
USER_SELECTED_MONTHS= 1,6,8,9,12
LIST_TO CHECK = 2,3,4,5,7,10,11
so, now you can do:
MONTH(start_date) NOT IN (2,3,4,5,7,10,11)
What do you think, could it help you?
regards