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    <p>You basically want to select every staff member from your staff table and then exclude anyone who logged in on a particular day. In short, this creates a list of PersonID not seen on a given day.</p> <p>This solution works, complete with example cases:</p> <pre><code>CREATE TABLE #temp (TimeSheetLogId INT IDENTITY(1,1), InTimeStamp DATETIME, OutTimeStamp DATETIME, PersonID INT); -- last week -- PersonID=1, didnt come to work last monday -- INSERT #temp VALUES ('2013-11-19 09:00:00.000','2013-11-19 17:00:00.000',1); INSERT #temp VALUES ('2013-11-20 09:00:00.000','2013-11-20 17:00:00.000',1); INSERT #temp VALUES ('2013-11-21 09:00:00.000','2013-11-21 17:00:00.000',1); INSERT #temp VALUES ('2013-11-22 09:00:00.000','2013-11-22 17:00:00.000',1); INSERT #temp VALUES ('2013-11-23 09:00:00.000','2013-11-23 17:00:00.000',1); -- 9AM-5PM shift INSERT #temp VALUES ('2013-11-19 09:00:00.000','2013-11-19 17:00:00.000',2); INSERT #temp VALUES ('2013-11-20 09:00:00.000','2013-11-20 17:00:00.000',2); INSERT #temp VALUES ('2013-11-21 09:00:00.000','2013-11-21 17:00:00.000',2); INSERT #temp VALUES ('2013-11-22 09:00:00.000','2013-11-22 17:00:00.000',2); INSERT #temp VALUES ('2013-11-23 09:00:00.000','2013-11-23 17:00:00.000',2); -- 11PM-7AM shift INSERT #temp VALUES ('2013-11-18 23:00:00.000','2013-11-19 07:00:00.000',3); INSERT #temp VALUES ('2013-11-19 23:00:00.000','2013-11-20 07:00:00.000',3); INSERT #temp VALUES ('2013-11-20 23:00:00.000','2013-11-21 07:00:00.000',3); INSERT #temp VALUES ('2013-11-21 23:00:00.000','2013-11-22 07:00:00.000',3); INSERT #temp VALUES ('2013-11-22 23:00:00.000','2013-11-23 07:00:00.000',3); -- this week INSERT #temp VALUES ('2013-11-25 09:00:00.000',NULL,1); INSERT #temp VALUES ('2013-11-25 09:00:00.000',NULL,2); INSERT #temp VALUES ('2013-11-24 23:00:00.000',NULL,3); DECLARE @ExamineDate DATE = '2013-11-19' -- You want to select DISTINCT PersonID from your main STAFF table that contains all records, I did this for simplicity! SELECT DISTINCT(PersonID) FROM #temp A EXCEPT -- this query should remain as-is SELECT PersonID FROM #temp A WHERE CAST(A.InTimeStamp AS DATE) = @ExamineDate OR CAST(A.OutTimeStamp AS DATE) = @ExamineDate ; DROP TABLE #temp; </code></pre>
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