include weekends on sql query - sql

Question

I have a database that stores the log-in and log-out of the employees but we don't have work on weekends. My supervisor want the DTR report format(I'm using RDLC report) include the weekends. (see attached image)
The image above is the expected output format for DTR. I just want to know how to include Weekends though my data are on weekdays only. Is it possible to do this using SQL Query? If yes, should I use looping in sql here?
SQL Code:
select user_id,log_date,login_time,logout_time
from table_DTR
where user_id = 'USER1'
AND log_date BETWEEN '11/21/2014' AND '12/09/2014'

Answer 1

Use common table expression and generate date range with from and to date and than use CTE as left join to actual table. I haven't used user_id filter in left join so apply it to your query:
DECLARE #TMEP TABLE
(
[Date] DATE,
[IN] VARCHAR(10),
[OUT] VARCHAR(10)
)
INSERT INTO #TMEP VALUES ('2014-11-11','7:30','5:30')
INSERT INTO #TMEP VALUES ('2014-11-12','7:30','5:30')
INSERT INTO #TMEP VALUES ('2014-11-13','7:30','5:30')
INSERT INTO #TMEP VALUES ('2014-11-14','7:30','5:30')
INSERT INTO #TMEP VALUES ('2014-11-15','7:30','5:30')
INSERT INTO #TMEP VALUES ('2014-11-18','7:30','5:30')
INSERT INTO #TMEP VALUES ('2014-11-19','7:30','5:30')
INSERT INTO #TMEP VALUES ('2014-11-20','7:30','5:30')
INSERT INTO #TMEP VALUES ('2014-11-21','7:30','5:30')
INSERT INTO #TMEP VALUES ('2014-11-22','7:30','5:30')
INSERT INTO #TMEP VALUES ('2014-11-25','7:30','5:30')
INSERT INTO #TMEP VALUES ('2014-11-26','7:30','5:30')
INSERT INTO #TMEP VALUES ('2014-11-27','7:30','5:30')
INSERT INTO #TMEP VALUES ('2014-11-28','7:30','5:30')
INSERT INTO #TMEP VALUES ('2014-11-29','7:30','5:30')
INSERT INTO #TMEP VALUES ('2014-12-1','7:30','5:30')
INSERT INTO #TMEP VALUES ('2014-12-2','7:30','5:30')
INSERT INTO #TMEP VALUES ('2014-12-3','7:30','5:30')
INSERT INTO #TMEP VALUES ('2014-12-4','7:30','5:30')
DECLARE #FromDate DATE
SET #FromDate = '2014-11-11 06:00:00.000'
DECLARE #ToDate DATE
SET #ToDate = '2014-12-11 06:00:00.000'
;WITH CTE_TableDate ([CTEDate]) as
(
SELECT #FromDate
UNION ALL
SELECT DATEADD(DAY,1,CTEDate) FROM CTE_TableDate WHERE [CTEDate] < #ToDate
)
SELECT
CTE_TableDate.CTEDate,
CASE WHEN DATEPART(DW, CTE_TableDate.CTEDate) = 7 THEN 'SATURDAY'
WHEN DATEPART(DW, CTE_TableDate.CTEDate) = 1 THEN 'SUNDAY'
ELSE TEMP.[In] END AS [IN],
CASE WHEN DATEPART(DW, CTE_TableDate.CTEDate) = 7 THEN 'SATURDAY'
WHEN DATEPART(DW, CTE_TableDate.CTEDate) = 1 THEN 'SUNDAY'
ELSE TEMP.[OUT] END AS [OUT]
FROM CTE_TableDate
LEFT JOIN
(
select
[Date],
[IN],
[OUT]
from
#TMEP) TEMP
ON
CTE_TableDate.CTEDate = TEMP.[Date]

Answer 2

try below solution :
DECLARE #startdate DATE = '11/21/2014' -- your start date
DECLARE #enddate DATE = '12/09/2014' -- your start date
-- create list of all dates between min(log_date) and MAX(log_date)
;WITH cte
AS (SELECT #startdate AS log_date
UNION ALL
SELECT Dateadd(dd, 1, log_date) log_date
FROM cte
WHERE log_date < #enddate)
-- select the data using left outer join so that it will return missing dates too.
SELECT t1.user_id,
c.log_date,
t2.login_time,
t2.logout_time
FROM cte c
CROSS JOIN (SELECT DISTINCT user_id
FROM mytable) t1
LEFT OUTER JOIN mytable t2
ON t2.user_id = t1.user_id
AND t2.log_date = c.log_date
ORDER BY t1.user_id,c.log_date
OPTION(maxrecursion 1000)
It will return null in time columns for weekends.
Note : if you are getting error : The statement terminated. The maximum recursion 100 has been exhausted before statement completion. then try using OPTION(maxrecursion 3000) or greater.

Answer 3

You can create a Calendar table as below:
CREATE TABLE dbo.Calendar
(
dt DATE PRIMARY KEY, -- use SMALLDATETIME if < SQL Server 2008
IsWorkDay BIT
);
DECLARE #s DATE, #e DATE;
SELECT #s = '2000-01-01' , #e = '2029-12-31';
INSERT dbo.Calendar(dt, IsWorkDay)
SELECT DATEADD(DAY, n-1, '2000-01-01'), 1
FROM
(
SELECT TOP (DATEDIFF(DAY, #s, #e)+1) ROW_NUMBER()
OVER (ORDER BY s1.[object_id])
FROM sys.all_objects AS s1
CROSS JOIN sys.all_objects AS s2
) AS x(n);
SET DATEFIRST 1;
-- weekends
UPDATE dbo.Calendar SET IsWorkDay = 0
WHERE DATEPART(WEEKDAY, dt) IN (6,7);
-- Christmas
UPDATE dbo.Calendar SET IsWorkDay = 0
WHERE MONTH(dt) = 12
AND DAY(dt) = 25
AND IsWorkDay = 1;
and then use the same as
DECLARE #table_DTR TABLE
( USER_ID VARCHAR(10),
log_date DATE,
login_time TIME,
logout_time TIME)
INSERT INTO #table_DTR VALUES ('USER1','11/21/2014','7:55:00','5:00:00')
select CASE d.IsWorkDay WHEN 0 THEN datename(dw,d.dt) else DTR.user_id END AS user_id,
d.dt AS log_date,
DTR.login_time,
DTR.logout_time
from dbo.Calendar d
LEFT JOIN #table_DTR DTR ON d.dt = DTR.log_date AND DTR.user_id = 'USER1'
WHERE d.dt BETWEEN '11/21/2014' AND '11/26/2014'
For detailed explanation on pros of Calendar table you can refer here..