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How to get the last two records per employee according to day column?

Posted on 2016-08-02
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Last Modified: 2016-08-03
Hi Experts,

I have a table with following columns
ID
EmployeeID
Day
SupvType

How can I get the last two records of this table per employee according to day column?

Add Note, only where SupvType is "Soc".

PS, Its an Access table.
0
Comment
Question by:bfuchs
9 Comments
 
LVL 54

Expert Comment

by:Ryan Chong
ID: 41740041
what's the values in the Day field and what's its data type?
0
 
LVL 49

Expert Comment

by:Dale Fye
ID: 41740063
Depends on what you want to do with the data.  One method, would be something like:

SELECT T1.ID, T1.Employee, T1.Day, T1.SupvType, Count(T2.ID) as EmpDayOrder
From yourTable as T1
LEFT JOIN yourTable as T2
ON T1.Employee = T2.Employee
AND T1.Day  <= T2.Day
GROUP BY T1.ID, T1.Employee, T1.Day, T1.SubvType
HAVING Count(T2.ID) <=2

Now, this SQL involves a non-equi join which matches each employee record against itself and then matches the day, which allows you to count the number of records in T2, where the Day >= T1.Day.  So for the most recent T1.Day value, there will only be 1 record in T2, which matches to each Employee/Day, for the 2nd most recent day in T1, there will be 2 records in T2 which match, so by setting the HAVING clause to select only the top 2 values

HTH
Dale
0
 
LVL 4

Author Comment

by:bfuchs
ID: 41740106
@Rayn,
Day is datetime and contains dates

@Dale,

1- Its giving me attached error
2- I need to see the entire record from this table, not only those 4 columns listed above.

Thanks,
Ben
untitled.png
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LVL 52

Accepted Solution

by:
Gustav Brock earned 1000 total points
ID: 41740262
You can use Top 2 for each:
Select * 
From YourTable
Where ID In 
    (Select Top 2 T.ID 
    From YourTable As T 
    Where T.EmployeeID = YourTable.EmployeeID 
    Order By T.[Day] Desc)
Order By EmployeeID, [Day] Desc

Open in new window

/gustav
0
 
LVL 49

Assisted Solution

by:Dale Fye
Dale Fye earned 1000 total points
ID: 41740392
change:

GROUP BY T1.ID, T1.Employee, T1.Day, T1.SubvType

to:

GROUP BY T1.ID, T1.Employee, T1.Day, T1.SupvType
0
 
LVL 4

Author Comment

by:bfuchs
ID: 41741187
Hi Experts,

Trying to figure out why Gustav's returns 20% more records than Dale's..

@Dale,
If I use yours, how can I get all columns?

Thanks,
Ben
0
 
LVL 49

Expert Comment

by:Dale Fye
ID: 41741248
You cannot with the method I used.

Or you would make what I provided a subquery and then join the table to the ID field of the subquery.
0
 
LVL 4

Author Closing Comment

by:bfuchs
ID: 41741335
Thanks Experts!

Interestingly, when I tried on the actual table needed, the diff was minor, less then 00.1%
0
 
LVL 4

Author Comment

by:bfuchs
ID: 41741730
Hi Experts,

It turned out that the table in question was a SQL table and therefore I was able to use the following query as pass-through which is extremely effecient.
select * from (
SELECT Patients.ID as pID, Patients.SocialSecurity,patients.FirstName,patients.LastName, PatientsCertificationPeriods_HC.*,
ROW_NUMBER() OVER(PARTITION BY PatientsCertificationPeriods_HC.PatientID 
ORDER BY PatientsCertificationPeriods_HC.FromDate desc, PatientsCertificationPeriods_HC.ToDate DESC) rnum
FROM Patients 
INNER JOIN PatientsCertificationPeriods_HC ON Patients.ID = PatientsCertificationPeriods_HC.PatientID
WHERE Patients.Active=1 
) a
where a.rnum < 3 and subject in ('Soc','WG Recert')

Open in new window


Thanks,
Ben
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