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# Case When Result

Posted on 2013-01-18
Medium Priority
336 Views
Dear Experts,
I am using below mentioned query to assign leave days to employee according to the company policy.
The result of this query of last column (Casual) should be zero in first five rows while the last row value is correct. I’m not been able to understand where I am doing wrong and not getting proper result. Would anyone see and guide me please how to correct it.
Rgds.
Iqbal

Declare @CC Varchar(2)
Set @CC='01'
;with ETC as
(Select Casual=Sum(Casual), Earned=Sum(Earned), Sick=Sum(Sick), MAternity=Sum(Maternity) from
(Select Casual=Case When OnAccount='Casual' then Days else 0 end
,Earned=Case When OnAccount='Earned' then Days else 0 end
,Sick=Case When OnAccount='Sick' then Days else 0 end
,Maternity=Case When OnAccount='Maternity' then Days else 0 end
from mtLeavePolicy a Where a.cc=@CC)x)

Select a.TransNo, WorkingYear, JoiningDate, RegsinedOn, StartingDate, EndingDate, Days=(DATEDIFF(d,  JoiningDate, EndingDate))
, Dayss=DateDiff(d,StartingDate,EndingDate)

, Casual=Case When JoiningDate<=b.StartingDate and RegsinedOn is null then c.Casual else
Case When JoiningDate<=b.StartingDate and RegsinedOn>=EndingDate then c.Casual else
Case When JoiningDate<=b.StartingDate and RegsinedOn<=EndingDate then Round(c.Casual/365*(DATEDIFF(d,  b.StartingDate, RegsinedOn)),0) else
Case When JoiningDate>=b.StartingDate and RegsinedOn is null then (DATEDIFF(d,  JoiningDate, EndingDate)) else 0 end end end end
from Emp_Info a
Cross Join mtYear b
Cross Join ETC c
Where a.CC=@CC and a.Branch='KHI' and a.EmpCode='00311'
Order by a.JoiningDate
Capture.JPG
0
Question by:Mehram
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LVL 11

Expert Comment

ID: 38794602
You actually have 4 nested CASE statements in your query, where only one is required. If you remove the unnecessary nesting, you get this:

``````Casual=Case When JoiningDate<=b.StartingDate and RegsinedOn is null then c.Casual
When JoiningDate<=b.StartingDate and RegsinedOn>=EndingDate then c.Casual
When JoiningDate<=b.StartingDate and RegsinedOn<=EndingDate then Round(c.Casual/365*(DATEDIFF(d,  b.StartingDate, RegsinedOn)),0)
When JoiningDate>=b.StartingDate and RegsinedOn is null then (DATEDIFF(d,  JoiningDate, EndingDate)) else 0 end
``````

Looking at the data you have in your result, RegsinedOn is always NULL, and JoiningDate is always >= StartingDate, therefore the last option applies:

When JoiningDate>=b.StartingDate and RegsinedOn is null then (DATEDIFF(d,  JoiningDate, EndingDate))

That's why you're getting the DATEDIFF calculated in that column instead of 0.
0

Author Comment

ID: 38796329
sir, result is still same. please correct my code
0

Author Comment

ID: 38796632
I have changed my query and also added resigned employee in list to get proper result. The query is running for the first to employee (00001 & 00008) perfectly. But the result of last employee 00311 is not correct. The serial # 11 to 14 should be 0 instead of display 2.

Declare @CC Varchar(2)
Set @CC='01'
;with ETC as
(Select Casual=Sum(Casual), Earned=Sum(Earned), Sick=Sum(Sick), MAternity=Sum(Maternity) from
(Select Casual=Case When OnAccount='Casual' then Days else 0 end
,Earned=Case When OnAccount='Earned' then Days else 0 end
,Sick=Case When OnAccount='Sick' then Days else 0 end
,Maternity=Case When OnAccount='Maternity' then Days else 0 end
from mtLeavePolicy a Where a.cc=@CC)x)

Select a.TransNo, WorkingYear, a.EmpCode, JoiningDate, RegsinedOn, StartingDate, EndingDate
, Dayss=DateDiff(d,StartingDate,EndingDate)
, Case when JoiningDate < StartingDate and RegsinedOn is null then c.casual
When JoiningDate < startingDAte and RegsinedOn > EndingDate  then c.Casual
When JoiningDate < startingDAte and RegsinedOn < EndingDate then 1
When JoiningDate > startingDAte and RegsinedOn Is null Then 2 else 0 end
from Emp_Info a
Cross Join mtYear b
Cross Join ETC c
Where a.CC=@CC and a.Branch='KHI' and (a.EmpCode='00008' or a.EmpCode='00001' or a.EmpCode='00311')
Order by a.EmpCode
Capture.JPG
0

LVL 143

Expert Comment

ID: 38796750
The serial # 11 to 14 should be 0 instead of display 2.
>  When JoiningDate > startingDAte and RegsinedOn Is null Then 2 else 0 end
actually, looking at this expression, they shall indeed all 4 return 2, as joining date > startdate and regsinedOn is null.

I don't see how this should be different?
0

Author Comment

ID: 38796761
sir, I'm working on it since yesterday and getting same result. is there anyother way to do that?
0

LVL 143

Expert Comment

ID: 38796788
to do what?
please clarify what is "wrong"? I understand the formula you wrote, compare to the data, and I would return the same results...
in other words: WHY should it return 0 there?
I presume you are comparing the wrong fields?
0

LVL 51

Expert Comment

ID: 38797836
Looking at the image of the query results, I have to agree with angelIII and a bit confused by your requirement.

for 00311 then joining date is in fact > starting date and regsinedOn is in fact NULL

it is the ONLY test where joining date is > starting date, so, maybe there are other conditions that need to be checked ?

Maybe if you descibe what that last column should be showing (not with code, just explanation) then we might be able to help decipher that case statement.

But so far, the results from your query looks quite correct given the T-SQL code.
0

LVL 39

Accepted Solution

appari earned 1000 total points
ID: 38799636
i think you need to add one more condition as follows:

Declare @CC Varchar(2)
Set @CC='01'
;with ETC as
(Select Casual=Sum(Casual), Earned=Sum(Earned), Sick=Sum(Sick), MAternity=Sum(Maternity) from
(Select Casual=Case When OnAccount='Casual' then Days else 0 end
,Earned=Case When OnAccount='Earned' then Days else 0 end
,Sick=Case When OnAccount='Sick' then Days else 0 end
,Maternity=Case When OnAccount='Maternity' then Days else 0 end
from mtLeavePolicy a Where a.cc=@CC)x)

Select a.TransNo, WorkingYear, a.EmpCode, JoiningDate, RegsinedOn, StartingDate, EndingDate
, Dayss=DateDiff(d,StartingDate,EndingDate)
, Case when JoiningDate < StartingDate and RegsinedOn is null then c.casual
When JoiningDate < startingDAte and RegsinedOn > EndingDate  then c.Casual
When JoiningDate < startingDAte and RegsinedOn < EndingDate then 1
When JoiningDate between startingDAte and EndingDate and RegsinedOn Is null Then 2
When JoiningDate > startingDAte and RegsinedOn Is null Then 2 else 0 end
from Emp_Info a
Cross Join mtYear b
Cross Join ETC c
Where a.CC=@CC and a.Branch='KHI' and (a.EmpCode='00008' or a.EmpCode='00001' or a.EmpCode='00311')
Order by a.EmpCode
0

LVL 51

Assisted Solution

Mark Wills earned 1000 total points
ID: 38799665
@appari, think that still returns a 2

Maybe the bold is better as :

``````When JoiningDate between startingDAte and EndingDate and RegsinedOn Is null Then 0

-- or given the less than and greater than, then probably more accurate to do

When JoiningDate > startingDAte and JoiningDate < EndingDate and RegsinedOn Is null Then 0
``````

Seems to match the expected result of 0 for those highlighted rows...

And yes, that is exactly the type of thing I meant about "additional conditions" needing to be checked.
0

LVL 39

Expert Comment

ID: 38799684
i think the condition should be

When JoiningDate > startingDAte and JoiningDate > EndingDate and RegsinedOn Is null Then 0
0

LVL 51

Expert Comment

ID: 38799716
*laughing* yep... Or even

when JoiningDate > Endingdate and regsinedon is null then 0

But, think it is an "extra" condition that currently isnt catered for... We'll only know once we hear back from Mehram
0

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