how to get the list from calendar table and merge to attendance table and leave table - sql

Question

I am using SQL Server 2008 R2. I have a problem in merging tables. We have 500+ employees
I have the following tables:
Calendar table - holds the dates from 1/1/2005 to 12/31/2016
Attendance table - for the attendance of employees
LeaveHistory table - for the leave history
LeaveBreakDown table -for leave break down
Holiday table - for holidays
Our goal, with date range from calendar (11/1/2015 - 11/30/2015)
we want to show the complete days even if the attendance is not equal to the total numbers of days.
Here's my first solution but too slow and without calendar table
FETCH NEXT FROM Employees INTO #EmployeeID,#BranchCode,#IsOfficer, #FirstName, #MiddleName, #LastName, #RankCode;
WHILE ##FETCH_STATUS = 0
BEGIN
WHILE #StartDate <= #EndDate
BEGIN
INSERT INTO #tblData(ActualDate,EmployeeID,BranchCode,IsOfficer, FirstName, MiddleName, LastName, RankCode, LeaveCode, Gender, ShiftCode,ShiftIn,ShiftOut,IsRestDay)
SELECT
#StartDate
, #EmployeeID
, #BranchCode
, #IsOfficer
, #FirstName
, #MiddleName
, #LastName
, #RankCode
, LB.LeaveBreakDownCode
, E.Gender
,ShiftCode = SS.ShiftCode
,ShiftIn = CONVERT(DATETIME, CONVERT(VARCHAR(20), DATEADD(day,0,#StartDate), 101) + ' ' + CONVERT(VARCHAR(20), SS.ShiftIn,108))
,ShiftOut = CASE
WHEN SS.ShiftOut < SS.ShiftIn THEN CONVERT(DATETIME, CONVERT(VARCHAR(20), DATEADD(day,1,#StartDate), 101) + ' ' + CONVERT(VARCHAR(20), SS.ShiftOut ,108))
ELSE CONVERT(DATETIME, CONVERT(VARCHAR(20), DATEADD(day,0,#StartDate), 101) + ' ' + CONVERT(VARCHAR(20), SS.ShiftOut ,108))
END
,IsRestDay = CASE
WHEN SS.Sunday = 1 AND DATEPART(weekday, #StartDate) = 1 THEN 1
WHEN SS.Monday = 1 AND DATEPART(weekday, #StartDate) = 2 THEN 1
WHEN SS.Tuesday = 1 AND DATEPART(weekday, #StartDate) = 3 THEN 1
WHEN SS.Wednesday = 1 AND DATEPART(weekday, #StartDate) = 4 THEN 1
WHEN SS.Thursday = 1 AND DATEPART(weekday, #StartDate) = 5 THEN 1
WHEN SS.Friday = 1 AND DATEPART(weekday, #StartDate) = 6 THEN 1
WHEN SS.Saturday = 1 AND DATEPART(weekday, #StartDate) = 7 THEN 1
ELSE 0
END
FROM Employees E
LEFT JOIN (
SELECT
LB.LeaveBreakDownCode
, LB.EmployeeID
FROM LeaveBreakDown LB
INNER JOIN LeaveHistory LH ON LH.LeaveHistoryCode = LB.LeaveHistoryCode AND LB.DateLeave = #StartDate AND LH.Status IN ('0','1')
WHERE LB.EmployeeID = #EmployeeID
) LB ON LB.EmployeeID = E.EmployeeID
LEFT JOIN ShiftSchedule SS ON SS.EmployeeID = E.EmployeeID AND #StartDate BETWEEN SS.EffectivityDate AND SS.EndDate
WHERE E.Status='1' AND E.ResignedDate IS NULL AND E.EmployeeID = #EmployeeID
SET #StartDate = DATEADD(day,1,#StartDate)
END
SET #StartDate = #InitialDate -- Reinitialize Start Date
FETCH NEXT FROM Employees INTO #EmployeeID, #BranchCode,#IsOfficer,#FirstName, #MiddleName, #LastName, #RankCode;
END;
CLOSE Employees;
DEALLOCATE Employees;
With this solution, if we are going to run the script. it took 3 minutes and sometimes 6minutes.
Might be the structure
Dates ('11/1/2015' - '11/30/2015')
-> Attendance
-> LeaveHistory
All dates from Dates table in date range will be filled with values from different table.

Answer 1

Don't use cursor.In fact it can be done without using RBAR/cursor.
You need to explain little more your table structure.Or start slowly with fewer column and table and ask where you are struck.
Calender Table is not require.What is the purpose of "ShiftSchedule" ?
You can do so by using recursive CTE.
Tell us more then we help you accordingly.
Recursive CTE sample.you can implemented your example here with fewer table and column then gradually increase.
DECLARE #StartDate DATETIME = '11/1/2015'
DECLARE #EndDate DATETIME = '11/30/2015';
WITH CTE
AS (
SELECT #StartDate DT
UNION ALL
SELECT DATEADD(day, 1, DT)
FROM CTE
WHERE DT < #EndDate
)
SELECT *
FROM CTE