SQL IF type logic help requested - sql

Question

I have a SQL problem that I have been stuck on for days. So this is the context. I work for a company where employees have timesheets. Each timesheet has an ID but it is not unique because it is possible for an employee to have 2 timesheets for the same ID. The difference is that normally when you submit the sheet your status is ‘Posted’. But, sometimes people screw up their entries and it has to get re-submitted with changes. Therefore, the status ‘Adjusted’.
The logic I need is the following
-Where timesheet ID’s only have one value (count=1) always use ‘Posted’ status. If there is only one value but it is not ‘Posted’ return an error string saying ‘Error’.
-where timesheet IDs have more than one value and BOTH ‘Posted’ and ‘Adjusted’ show up as status always default to ‘Adjusted’. BOTH posted and adjusted must be present in this.
I have tried case and subquery but no luck. I also have a column ‘timesheet post date’ and logic is earliest date is always posted and later date is ‘adjusted’, but in some cases the posting dates are identical.
so as you can see, I need to look at the duplicate count in one column, and then choose the value if that count is >1 from another column.
SELECT t1.[Resource NUID]
,t1.[Timesheet ID]
,t1.[Timesheet Start Date]
,t1.[Timesheet End Date]
,t1.[Timesheet Posted Date]
,t1.[Timesheet Status]
,t1.[RunSourceID]
,t1.[SpanStartDate]
,t1.[SpanEndDate]
FROM [TIME_DW].[dbo].[Timecard_Timesheets] as t1, [TIME_DW].[dbo]. [Timecard_Timesheets] as t2
where t1.[Timesheet ID]=t2.[Timesheet ID]
and t1.[Resource NUID]='e066308' and t1.[Timesheet Status]<>'Open' and t1.[Timesheet Status]<>'Submitted'
group by
t1.[Resource NUID]
,t1.[Timesheet ID]
,t1.[Timesheet Start Date]
,t1.[Timesheet End Date]
,t1.[Timesheet Posted Date]
,t1.[Timesheet Status]
,t1.[RunSourceID]
,t1.[SpanStartDate]
,t1.[SpanEndDate]
order by t1.[Timesheet Start Date] asc
this is an example of an actual record that has two statuses
thanks

Answer 1

I am expecting logic like this:
select timesheet_id,
(case when count(*) = 1 and min(status) = 'Posted' then min(status)
when count(*) = 1 then 'Error'
when min(status) = 'Adjusted' and max(status) = 'Posted' then 'Adjusted'
else NULL -- this case is not covered in the description
end) as new_status
from [TIME_DW].[dbo].[Timecard_Timesheets]
group by timesheet_id;
I don't understand what all the other columns are going in the code in the question.

Answer 2

This should get you going in the right direction:
First we count rows by TimeSheet Id (CN) and we assign a row_number (RN) ordered by "Adjusted" records first, then everything else (you might want to add an adjustment date as a 2nd order by to get the most recent one first).
Then we add an error status if the first and only row is not a Status of "Posted".
Finally we select out only the rows WHERE RN=1
DECLARE #TimeSheet TABLE (Id INT, Status VARCHAR(15))
INSERT INTO #TimeSheet (Id,Status)
VALUES
(1,'Posted'),
(2,'Posted'),
(2,'Adjusted'),
(3,'Adjusted')
;WITH X AS
(
SELECT COUNT(2) OVER(PARTITION BY Id) AS CN,
ROW_NUMBER() OVER(PARTITION BY Id ORDER BY CASE WHEN Status='Adjusted' THEN 0 ELSE 1 END) AS RN,
*
FROM #TimeSheet
), Y AS
(
SELECT CASE WHEN CN=1 AND RN=1 AND Status<>'Posted' THEN 'Error'
ELSE ''
END AS Error,
*
FROM X
)
SELECT *
FROM Y
WHERE RN=1

Answer 3

from your code, I think you were trying to do this :
SELECT
ts.[Resource NUID]
, ts.[Timesheet ID]
, ts.[Timesheet Start Date]
, ts.[Timesheet End Date]
, ts.[Timesheet Posted Date]
, ts.[Timesheet Status]
, ts.[RunSourceID]
, ts.[SpanStartDate]
, ts.[SpanEndDate]
FROM
[TIME_DW].[dbo].[Timecard_Timesheets] as ts
JOIN (
SELECT *
, CASE
WHEN TimeSheetCount > 1 AND [Timesheet Status] <> 'Posted' THEN 'Adjusted'
WHEN TimeSheetCount = 1 AND [Timesheet Status] <> 'Posted' THEN 'Error'
ELSE 'Posted'
END NewStatus
FROM (
SELECT *
, COUNT(*) OVER(PARTITION BY t1.[Timesheet ID]) TimeSheetCount
, ROW_NUMBER() OVER(ORDER BY t1.[Timesheet Start Date]) RN
FROM
[TIME_DW].[dbo].[Timecard_Timesheets] as t1
) D
) t2 ON ts.[Timesheet ID] = t2.[Timesheet ID]
WHERE
ts.[Resource NUID] = 'e066308'
AND ts.[Timesheet Status] <> 'Open'
AND ts.[Timesheet Status] <> 'Submitted'