How can do a Join between 2 tables ?

Question

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SQL-Server-2008R2

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I'm trying to display data from 2 tables: the first Table is "Emp_OverTime" is like :

EmployeeID       DateOvertime    DurationOfOverTime     AchievedDuration
27                22-06-2015        2                     1
27                23-06-2015        2                     2

The second table is "Emp_Attendance" like this:

EmployeeID          ModeAttendance      Date              Time  
27                   OverTimeIn         22-06-2015         17:00:00
27                   OverTimeOut        22-06-2015         18:00:00
27                   OverTimeIn         23-06-2015         19:00:00
27                   OverTimeOut        23-06-2015         20:00:00

what I need is obtaining for each date of attendance and for each employee the TimeIn , the timeOut for each overtime, the durationOfOverTime, AchievedDuration. Like Below:

EmpID Date       Duration  AchievedDuration   TimeOfOverTimeIn TimeOfOverTimeOut
27    22-06-2015    2        1                17:00:00         18:00:00
27    23-06-2015    2        2                19:00:00         20:00:00

I try this query:

SQL

select employeeid, overtimedate, duration, achievedduration
, (select Emp_AttendanceByDevice.wHour from Emp_AttendanceByDevice
where MONTH(Date)=6 and EmployeeID=27 and InOutMode='OverTimeIn') as OverTimeIn
, (select Emp_AttendanceByDevice.wHour from Emp_AttendanceByDevice
where MONTH(Date)=6 and EmployeeID=27 and InOutMode='OverTimeOut')  as OverTimeOut
 from Emp_OverTimeScheduler
 inner join Emp_AttendanceByDevice on Emp_AttendanceByDevice.EmployeeID=Emp_OverTimeScheduler.employeeid
  where employeeid =27 and MONTH(overtimedate)=6
  group by  employeeid, overtimedate, duration, achievedduration

But it gives me an error message ; the subquery returns more than 1 value
Any Idea please ?

Posted 24-Jun-15 6:07am

Leila Toumi

Updated 24-Jun-15 6:37am

v5

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2 solutions

Solution 1

Run your sub-queries and determine "if" it's true - or more correctly, decide what you need to do to the sub-queries WHERE clause to return only one value and that value the one that you want.

Posted 24-Jun-15 7:26am

W∴ Balboos, GHB

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Maciej Los · Accepted Answer · 2015-06-24T11:14:00

Try this:

SQL

--SET DATEFORMAT dmy;

DECLARE @a TABLE (EmployeeID INT, DateOvertime DATE, DurationOfOverTime INT, AchievedDuration INT)
INSERT INTO @a (EmployeeID, DateOvertime, DurationOfOverTime, AchievedDuration)
VALUES(27, '22-06-2015', 2, 1), (27, '23-06-2015', 2, 2)

DECLARE @b TABLE(EmployeeID INT, ModeAttendance VARCHAR(50), [Date] DATE, [Time] VARCHAR(50))
INSERT INTO @b (EmployeeID, ModeAttendance, [Date], [Time])
VALUES(27, 'OverTimeIn', '22-06-2015', '17:00:00'),
(27, 'OverTimeOut', '22-06-2015', '18:00:00'),
(27, 'OverTimeIn', '23-06-2015', '19:00:00'),
(27, 'OverTimeOut', '23-06-2015', '20:00:00')

SELECT t1.EmployeeID, t1.DateOvertime, t1.DurationOfOverTime, t1.AchievedDuration, t2.TimeOverTimeIn, t2.TimeOverTimeOut
FROM @a AS t1 INNER JOIN (
    SELECT EmployeeID, [Date], OverTimeIn  AS [TimeOverTimeIn],  OverTimeOut AS [TimeOverTimeOut]
    FROM (
        SELECT *
        FROM @b
    ) AS DT
    PIVOT(MAX([Time]) FOR ModeAttendance IN([OverTimeIn], [OverTimeOut])) AS DT
    ) AS t2 ON t1.EmployeeID = t2.EmployeeID AND t1.DateOvertime = t2.Date

Result:

27	2015-06-22	2	1	17:00:00	18:00:00
27	2015-06-23	2	2	19:00:00	20:00:00