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Create a timeline of 3 tables in SQL Server

I have 3 tables with event dates that I am trying to combine to complete a timeline table. I am not sure what the best way to implement what I need is, and was hoping to get a little help.

My first table is the employee table. It contains four columns

EmployeeId, HiredDate, CommencedDate, ResignDate, and FinishDate.

When an employee is hired, he receives an entry in the table with the columns EmployeeId and HiredDate. If necessary, the table is constantly updated.

CREATE TABLE Employees (EmployeeId INT NOT NULL, HiredDate DATE NOT NULL, CommencedDate DATE NULL, ResignDate DATE NULL, FinishDate DATE NULL)
Insert Employees Values (111, '2012-01-02', '2012-01-05', '2012-03-15', '2012-04-06')
Insert Employees Values (112, '2012-01-05', '2012-01-10', NULL, NULL)

The second table, called ReportingCycles, which contains reportingCycleId, startDate, and endDate. The number of days in the reporting cycle varies.

CREATE TABLE ReportingCycles (reportingCycleId INT NOT NULL, startDate DATE NOT NULL, endDate DATE NOT NULL)
INSERT ReportingCycles Values (1,'2011-12-03','2011-12-31')
INSERT ReportingCycles Values (2,'2012-01-01','2012-01-30')
INSERT ReportingCycles Values (3,'2012-01-31','2012-02-27')
INSERT ReportingCycles Values (4,'2012-02-28','2012-04-02')
INSERT ReportingCycles Values (5,'2012-04-03','2012-04-28')
INSERT ReportingCycles Values (6,'2012-04-29','2012-05-28')
INSERT ReportingCycles Values (7,'2012-05-29','2012-07-01')
INSERT ReportingCycles Values (8,'2012-07-02','2012-08-01')
INSERT ReportingCycles Values (9,'2012-08-02','2012-08-28')
INSERT ReportingCycles Values (10,'2012-08-29','2012-09-29')
INSERT ReportingCycles Values (11,'2012-09-30','2012-10-28')
INSERT ReportingCycles Values (12,'2012-10-29','2012-11-26')
INSERT ReportingCycles Values (13,'2012-11-27','2012-12-26')
INSERT ReportingCycles Values (14,'2012-12-27','2013-01-21')
INSERT ReportingCycles Values (15,'2013-01-22','2013-02-21')

, . , , . , 1 , . 1 .

CREATE TABLE Duties (EmployeeId INT NOT NULL, LocationId INT NOT NULL, AssignmentStartDate DATE NOT NULL, AssignmentEndDate DATE NULL, AssignmentValue Decimal(18,2) NOT NULL)
INSERT Duties Values (111, 0, '2012-01-02', '2012-01-04', 1.00)
INSERT Duties Values (111, 25, '2012-01-05', '2012-01-10', 1.00)
INSERT Duties Values (111, 30, '2012-01-11', '2012-04-06', 0.25)
INSERT Duties Values (111, 31, '2012-01-11', '2012-04-06', 0.25)
INSERT Duties Values (111, 32, '2012-01-11', '2012-04-06', 0.25)
INSERT Duties Values (111, 33, '2012-01-11', '2012-04-06', 0.25)
INSERT Duties Values (112, 0, '2012-01-05', '2012-01-09', 1)
INSERT Duties Values (112, 70, '2012-01-10', NULL, 1)

, , - . :

CREATE TABLE EmployeeTimelime (
fromDate DATE NOT NULL, 
toDate DATE NOT NULL, 
reportingCycleId INT NOT NULL, 
employeeId INT NOT NULL, 
LocationId INT NOT NULL, 
AssignmentValue Decimal(18,2),
Hired INT NOT NULL, 
Commenced INT NOT NULL, 
Resigned INT NOT NULL, 
Finished Int NOT NULL, 
startCycle INT NOT NULL, 
endCycle INT NOT NULL)

Hired, Commuted, Resigned, Finished, startCycle endCycle 0 1, , . 111 :

Insert EmployeeTimelime Values ('2012-01-02','2012-01-04',2,111,0,1,1,0,0,0,0,0)
Insert EmployeeTimelime Values ('2012-01-05','2012-01-10',2,111,25,1,0,1,0,0,0,0)
Insert EmployeeTimelime Values ('2012-01-11','2012-01-30',2,111,30,0.25,0,0,0,0,0,1)
Insert EmployeeTimelime Values ('2012-01-11','2012-01-30',2,111,31,0.25,0,0,0,0,0,1)
Insert EmployeeTimelime Values ('2012-01-11','2012-01-30',2,111,32,0.25,0,0,0,0,0,1)
Insert EmployeeTimelime Values ('2012-01-11','2012-01-30',2,111,33,0.25,0,0,0,0,0,1)
Insert EmployeeTimelime Values ('2012-01-31','2012-02-27',3,111,30,0.25,0,0,0,0,1,1)
Insert EmployeeTimelime Values ('2012-01-31','2012-02-27',3,111,31,0.25,0,0,0,0,1,1)
Insert EmployeeTimelime Values ('2012-01-31','2012-02-27',3,111,32,0.25,0,0,0,0,1,1)
Insert EmployeeTimelime Values ('2012-01-31','2012-02-27',3,111,33,0.25,0,0,0,0,1,1)
Insert EmployeeTimelime Values ('2012-02-28','2012-03-14',4,111,30,0.25,0,0,0,0,1,0)
Insert EmployeeTimelime Values ('2012-02-28','2012-03-14',4,111,31,0.25,0,0,0,0,1,0)
Insert EmployeeTimelime Values ('2012-02-28','2012-03-14',4,111,32,0.25,0,0,0,0,1,0)
Insert EmployeeTimelime Values ('2012-02-28','2012-03-14',4,111,33,0.25,0,0,0,0,1,0)
Insert EmployeeTimelime Values ('2012-03-15','2012-04-02',4,111,30,0.25,0,0,1,0,0,1)
Insert EmployeeTimelime Values ('2012-03-15','2012-04-02',4,111,31,0.25,0,0,1,0,0,1)
Insert EmployeeTimelime Values ('2012-03-15','2012-04-02',4,111,32,0.25,0,0,1,0,0,1)
Insert EmployeeTimelime Values ('2012-03-15','2012-04-02',4,111,33,0.25,0,0,1,0,0,1)
Insert EmployeeTimelime Values ('2012-04-03','2012-04-05',5,111,30,0.25,0,0,0,0,1,0)
Insert EmployeeTimelime Values ('2012-04-03','2012-04-05',5,111,31,0.25,0,0,0,0,1,0)
Insert EmployeeTimelime Values ('2012-04-03','2012-04-05',5,111,32,0.25,0,0,0,0,1,0)
Insert EmployeeTimelime Values ('2012-04-03','2012-04-05',5,111,33,0.25,0,0,0,0,1,0)
Insert EmployeeTimelime Values ('2012-04-06','2012-04-06',5,111,30,0.25,0,0,0,1,0,0)
Insert EmployeeTimelime Values ('2012-04-06','2012-04-06',5,111,31,0.25,0,0,0,1,0,0)
Insert EmployeeTimelime Values ('2012-04-06','2012-04-06',5,111,32,0.25,0,0,0,1,0,0)
Insert EmployeeTimelime Values ('2012-04-06','2012-04-06',5,111,33,0.25,0,0,0,1,0,0)

, :

SELECT *
FROM Employees x

Join ReportingCycles y
on (y.startDate between x.HiredDate and Coalesce(x.FinishDate, '9999-12-31') 
or y.endDate between x.HiredDate and Coalesce(x.FinishDate, '9999-12-31') )

Left Join Duties z
on z.EmployeeId = x.EmployeeId 
and (z.AssignmentStartDate  between y.startDate and y.endDate 
or Coalesce(z.AssignmentEndDate, '9999-12-31') between y.startDate and y.endDate 
)

Order by x.EmployeeId, y.reportingCycleId

, .

+4
1
---------------------------------------------------
-- Preparation of Data
---------------------------------------------------
DECLARE @EmployeeTimelime table (
    fromDate DATE NOT NULL, 
    toDate DATE NOT NULL, 
    reportingCycleId INT NOT NULL, 
    employeeId INT NOT NULL, 
    LocationId INT NOT NULL, 
    AssignmentValue Decimal(18,2),

    -- Should be using bit data type for boolean values
    Hired INT NOT NULL,
    Commenced INT NOT NULL, 
    Resigned INT NOT NULL, 
    Finished Int NOT NULL, 
    startCycle INT NOT NULL, 
    endCycle INT NOT NULL 
)

DECLARE @Employees table (employeeId INT NOT NULL, HiredDate DATE NOT NULL, CommencedDate DATE NULL, ResignDate DATE NULL, FinishDate DATE NULL)
INSERT @Employees Values 
(111, '2012-01-02', '2012-01-05', '2012-03-15', '2012-04-06')
,(112, '2012-01-05', '2012-01-10', NULL, NULL)

DECLARE @ReportingCycles table (reportingCycleId INT NOT NULL, startDate DATE NOT NULL, endDate DATE NOT NULL)
INSERT @ReportingCycles Values 
(1,'2011-12-03','2011-12-31')
,(2,'2012-01-01','2012-01-30')
,(3,'2012-01-31','2012-02-27')
,(4,'2012-02-28','2012-04-02')
,(5,'2012-04-03','2012-04-28')
,(6,'2012-04-29','2012-05-28')
,(7,'2012-05-29','2012-07-01')
,(8,'2012-07-02','2012-08-01')
,(9,'2012-08-02','2012-08-28')
,(10,'2012-08-29','2012-09-29')
,(11,'2012-09-30','2012-10-28')
,(12,'2012-10-29','2012-11-26')
,(13,'2012-11-27','2012-12-26')
,(14,'2012-12-27','2013-01-21')
,(15,'2013-01-22','2013-02-21')

DECLARE @Duties table (EmployeeId INT NOT NULL, LocationId INT NOT NULL, AssignmentStartDate DATE NOT NULL, AssignmentEndDate DATE NULL, AssignmentValue Decimal(18,2) NOT NULL)
INSERT @Duties Values 
(111, 0, '2012-01-02', '2012-01-04', 1.00)
,(111, 25, '2012-01-05', '2012-01-10', 1.00)
,(111, 30, '2012-01-11', '2012-04-06', 0.25)
,(111, 31, '2012-01-11', '2012-04-06', 0.25)
,(111, 32, '2012-01-11', '2012-04-06', 0.25)
,(111, 33, '2012-01-11', '2012-04-06', 0.25)
,(112, 0, '2012-01-05', '2012-01-09', 1)
,(112, 70, '2012-01-10', NULL, 1)


---------------------------------------------------
-- The logic lays below
---------------------------------------------------

;WITH dates(Value, EndDate) AS -- tally table of dates
(
    SELECT MIN(HiredDate), MAX(ISNULL(ResignDate, GETDATE())) FROM @Employees
    UNION ALL
    SELECT DATEADD(DAY, 1, Value), EndDate FROM dates WHERE DATEADD(DAY, 1, Value) <= EndDate
), data AS -- Prepare the non-grouped data, with well declared relations
(
    SELECT 
        d.Value, e.employeeId, rc.reportingCycleId, du.LocationId, du.AssignmentValue, 
        CASE WHEN e.HiredDate = d.Value THEN 1 ELSE 0 END AS HiredFlag,
        CASE WHEN e.CommencedDate = d.Value THEN 1 ELSE 0 END AS CommencedFlag,
        CASE WHEN e.ResignDate >= d.Value THEN 1 ELSE 0 END AS ResignFlag,
        CASE WHEN e.FinishDate = d.Value THEN 1 ELSE 0 END AS FinishFlag, 
        CASE WHEN rc.startDate = d.Value THEN 1 ELSE 0 END AS CycleStartFlag, 
        CASE WHEN rc.endDate = d.Value THEN 1 ELSE 0 END AS CycleEndFlag, 
        -- Magically group by continuous dates by employee and location
        ROW_NUMBER() OVER (PARTITION BY e.employeeId, du.LocationId ORDER BY Value) rn_loc, 
        DENSE_RANK() OVER (PARTITION BY e.employeeId ORDER BY Value) rn
        -- End Magic
    FROM 
        @Employees e 
        CROSS JOIN dates d
        INNER JOIN @Duties du ON d.Value BETWEEN du.AssignmentStartDate AND ISNULL(du.AssignmentEndDate, '9999-12-31') AND du.employeeId = e.employeeId
        INNER JOIN @ReportingCycles rc ON d.Value BETWEEN rc.startDate AND rc.endDate
)
INSERT @EmployeeTimelime
SELECT 
    MIN(Value) AS fromDate, MAX(Value) AS toDate, reportingCycleId, employeeId, locationId, assignmentValue, 
    MAX(HiredFlag) AS Hired,
    MAX(CommencedFlag) AS Commenced,
    ResignFlag AS Resigned,
    FinishFlag AS Finished,
    MAX(CycleStartFlag) AS startCycle,
    MAX(CycleEndFlag) AS endCycle
FROM data
GROUP BY EmployeeId, reportingCycleId, locationId, assignmentValue, ResignFlag, FinishFlag, rn - rn_loc
--ORDER BY fromDate, toDate, employeeId, reportingCycleId, LocationId
OPTION (MAXRECURSION 0)

SELECT * FROM @EmployeeTimelime WHERE employeeId = '111'

SQL Fiddle

+2

Source: https://habr.com/ru/post/1609395/

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