Создание временной шкалы из 3 таблиц в SQL Server

Question

У меня есть 3 таблицы с датами события, которые я пытаюсь объединить, чтобы в итоге получить таблицу временной шкалы. Я не уверен, что лучший способ реализовать то, что мне нужно, и надеялся получить небольшую помощь.

Мой первый стол - таблица сотрудников. Он содержит четыре колонки

EmployeeId, HiredDate, CommencedDate, ResignDate, and FinishDate. 

Когда сотрудник нанимается они получают запись в таблице со столбцами EmployeeID и HiredDate. При необходимости таблица постоянно обновляется.

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) 

Вторая таблица называется ReportingCycles, который содержит reportingCycleId, startDate, and endDate столбцы. Количество дней в цикле отчетности меняется.

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') 

Мой третий стол называется Обязанности, которые для каждого сотрудника показывают местоположение сотрудника в определенные даты. Это заполнено фиктивным местоположением в случае, когда работник был нанят, но еще не начался. Также возможно, чтобы работник находился в более чем 1 месте в пределах диапазона дат, поэтому задано значение присвоения. Значение присваивания для диапазона дат всегда будет равно 1 для одного сотрудника.

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) 

Теперь, я хочу, чтобы все эти таблицы соединялись и заканчивались временной шкалой для каждого сотрудника. Результате таблица будет иметь следующие столбцы:

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) 

, где Hired, началось, Смирившись, отделан, startCycle и endCycle столбцы содержат 0 или 1, показывающий значение, какой тип записи это. Для сотрудника 111, таблица будет выглядеть следующим образом:

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) 

Я начал с этим запросом, но это не правильно:

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 

Спасибо всем, кто может помочь.

Answer 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