First of all I would like to thank the friends who helped this complex and difficult query.
I have three tables
Table 1
StaffId FirstName LastName staffType
---------------------------------------
1 Adam Sorme Student
2 Lara Sandra Teacher
3 Jack Jones Student
Table 2
GateId GateName
---------------------------------------
1 frontDoor
2 superDoor
Table 3
Id transitionDate GateId StaffId
---------------------------------------
1 2018-01-1 08:00:00 1 1
2 2018-01-1 10:00:00 2 1
3 2018-01-1 20:00:00 2 1
4 2018-01-2 07:00:00 1 2
5 2018-01-2 10:00:00 1 3
6 2018-01-9 12:00:00 2 2
I want the first and last movements of students for each day. Value must be set to null if no movement is available between the specified dates
transitionDate> '2018-01-1 00:00:00 000'
and transitionDate< '2018-01-03 00:00:00 000'
OUTPUT:
Id Date MinTransitionDate MaxTransitionDate FirstGateName LastGateName StaffId StaffType
1 2018-01-01 2018-01-1 08:00:00 2018-01-1 20:00:00 frontDoor superDoor 1 Student
2 2018-01-01 null null null null 3 student
3 2018-01-02 null null null null 1 student
4 2018-01-02 2018-01-2 10:00:00 null frontDoor null 3 student
you can try a query like below
see working demo
create table staff(StaffId int, FirstName nvarchar(10), LastName nvarchar(10), staffType nvarchar(10))
insert into staff values
(1,'Adam','Sorme','Student')
,(2,'Lara','Sandra','Teacher')
,(3,'Jack','Jones','Student')
go
create table gate(GateId int, GateName nvarchar(10))
insert into gate values
(1,'frontDoor')
,(2,'superDoor')
go
create table logs
(Id int, transitionDate datetime, GateId int, StaffId int)
insert into logs values
(1,'2018-01-1 08:00:00',1,1)
,(2,'2018-01-1 10:00:00',2,1)
,(3,'2018-01-1 20:00:00',2,1)
,(4,'2018-01-2 07:00:00',1,2)
,(5,'2018-01-2 10:00:00',1,3)
,(6,'2018-01-9 12:00:00',2,2)
go
declare @startdate datetime, @enddate datetime
select @startdate='2018-01-1 00:00:00' , @enddate='2018-01-03 00:00:00'
; with tempSet as
(
select
transitionDatetime=l.transitionDate,
gateName=g.gateName,
staffid=l.staffid,
idx=
row_number() over(partition by l.staffid order by l.transitionDate ) -
row_number() over(partition by l.staffid,cast(l.transitionDate as date) order by l.transitionDate ),
transitionDate=cast(l.transitionDate as date)
from
logs l inner join staff s on
l.staffid=s.staffid and staffType='Student'
join gate g on g.gateid=l.gateid
)
, groupedSet as
(
select
t1.*,
FirstGateName=t2.gatename,
lastGateName=t3.gatename
from
(
select
staffid,
mintransitionDate=min(transitionDatetime),
maxtransitionDate= case when count(1)>1 then max(transitionDatetime) else null end,
transitionDate=max(transitionDate),
idx
from
tempSet
group by staffid,idx
) t1
left join
tempSet t2
on t1.idx=t2.idx
and t1.staffid=t2.staffid and t1.mintransitionDate=t2.transitionDatetime
left join
tempSet t3
on t1.idx=t3.idx
and t1.staffid=t3.staffid and t1.maxtransitionDate=t3.transitionDatetime
where t1.transitionDate between @startdate and @enddate
)
select
t.*,
g.mintransitionDate,
g.maxtransitionDate,
g.FirstGateName,
g.LastGateName
from
groupedSet g
right join
(
select
d,
staffid
from
(
select
top (select datediff(d,@startdate, @endDate))
d=dateadd(d,row_number() over(order by (select null))-1, @startDate)
from
sys.objects o1 cross join sys.objects o2
)tally
cross join
staff
where staff.stafftype='Student'
)t
on cast(t.d as date)=cast(g.transitionDate as date) and t.staffid=g.staffid
order by t.d asc, t.staffid asc
All insert statements:
create table #Staff (StaffId int, FirstName varchar(20), LastName varchar(20), staffType varchar(20))
insert into #Staff values
(1, 'Adam', 'Sorme', 'Student'),
(2, 'Lara', 'Sandra', 'Teacher'),
(3, 'Jack', 'Jones', 'Student')
create table #Gates (GateId int, GateName varchar(20))
insert into #Gates values
(1, 'frontDoor'),
(2, 'backDoor')
create table #Transitions (Id int, transitionDate datetime, GateId int, StaffId int)
insert into #Transitions values
(1, '2018-01-1 08:00:00', 1, 1),
(2, '2018-01-1 10:00:00', 2, 1),
(3, '2018-01-1 20:00:00', 2, 1),
(4, '2018-01-2 07:00:00', 1, 2),
(5, '2018-01-2 10:00:00', 1, 3),
(6, '2018-01-9 12:00:00', 2, 2)
In order to get desired result, you'll need CTE with all days between range. Limits (dates) of range you specify in variables included in below query.
declare @maxTransitionDate datetime, @minTransitionDate datetime
select @maxTransitionDate='2018-01-10', @minTransitionDate='2018-01-01'
;with cte as (
select @minTransitionDate [Days]
union all
select dateadd(day,1,[Days]) from cte where [Days] < @maxTransitionDate
)
,cte2 as (
select [Days], [StaffId], [FirstName], [LastName] from cte cross apply #staff where stafftype ='Student'
)
select C.[Days] [Date], C.[staffid], C.FirstName, C.LastName, A.mintransitiondate, A.[maxtransitiondate], A.firstgatename, A.lastgatename, A.staffType from (
select T.[Date],
T.staffid,
T.mintransitiondate,
case when T.maxtransitiondate <> T.mintransitiondate then T.maxtransitiondate end [maxtransitiondate],
(select gatename from #gates where gateid = T.firstgateid) firstgatename,
(select gatename from #gates where gateid = T.lastgateid) lastgatename,
S.FirstName,
S.LastName,
S.staffType
from (
select [date], staffid,
max(case when rn = 1 then transitiondate end) mintransitiondate,
max(case when rn = cnt then transitiondate end) maxtransitiondate,
max(case when rn = 1 then GateId end) FirstGateId,
max(case when rn = cnt then GateId end) LastGateId
from (
select *, cast(transitiondate as date) [Date],
row_number() over (partition by staffid, cast(transitiondate as date) order by transitiondate) [rn],
count(*) over (partition by staffid, cast(transitiondate as date)) [cnt]
from #Transitions
) a group by staffid, [date]
) [T] join #Staff [S] on T.staffid = S.staffid
where S.staffType = 'Student'
) [A] right join cte2 [C] on A.[Date] = C.[Days] and A.[staffid] = C.[staffid]
The other answers seem so complicated.
First, use cross join to get all the rows. Then use left join and aggregation to get the information you want.
The basic query looks like this:
select s.staffId, d.dte,
min(t.transitionDate) as first_change,
max(t.transitionDate) as first_change,
max(case when seqnum_asc = 1 then gateId end) as first_gateid,
max(case when seqnum_desc = 1 then gateId end) as last_gateid
from (select s.* from Staff s where stafftype = 'Student') s cross join
(select distinct cast(transitionDate as date) as dte from Transitions) d left join
(select t.*,
row_number() over (partition by StaffId, cast(transitionDate as date) order by transitionDate) as seqnum_asc,
row_number() over (partition by StaffId, cast(transitionDate as date) order by transitionDate desc) as seqnum_desc
from Transitions t
) t
on cast(t.transitiondate as date) = d.dte and
t.staffId = s.staffId and
1 in (t.seqnum_asc, t.seqnum_desc)
group by s.staffId, d.dte;
You can enhance the select to bring back more columns.
Here is a SQL Fiddle.
