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SQL Select Statement with MAX

Posted on 2012-04-04
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Last Modified: 2012-04-04
I need assistanace in combining this SQL Statement.
SQL A-

SELECT Transaction_DateTimestamp, Total_Hours, Date1, Employee_Name, Travel_Time from GrooveImports where Date1 >= '4/5/2012' and Date1 <= '4/8/2012' and Employee_Name = 'XYZ'

produces a list of employee dates and times with each record having a date timestamp of when the record was last modified. However, SQL A also retrieves ALL records between those dates, where I need to only return the MAX (DateTimestamp) of each day, so only the latest modified record is returned.

When I use the below statement for 1 day, this returns the latest record for that day.
So my question, is how can I return the latest record for each day when given a date range? (I am thinking it is a union, and/ or creating a temp table, but I am not the expert)


SELECT Transaction_DateTimestamp, Total_Hours, Date1, Employee_Name, Travel_Time from GrooveImports where Date1= '4/5/2012' AND  (GrooveImports.Transaction_DateTimeStamp =
                          (SELECT     MAX(Transaction_DateTimeStamp) AS Expr1
                            FROM          GrooveImports AS GrooveImports_1
                            WHERE      (Date1 = '4/4/2012')))
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Question by:BKennedy2008
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6 Comments
 
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Accepted Solution

by:
wshark83 earned 500 total points
ID: 37806161
how about:

SELECT a.Transaction_DateTimestamp, a.Total_Hours, a.Date1, a.Employee_Name, a.Travel_Time
from GrooveImports a
join  (SELECT     date1, MAX(Transaction_DateTimeStamp) AS Expr1
         FROM          GrooveImports
         Group by date1) b
on a.date1 = b.date1
and a.Transaction_DateTimeStamp = b.expr1
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Author Comment

by:BKennedy2008
ID: 37806218
Will try
0
 
LVL 9

Expert Comment

by:sachinpatil10d
ID: 37806228
Try this

SELECT max(Transaction_DateTimestamp) DateTimestamp, Total_Hours, Date1, Employee_Name, Travel_Time from GrooveImports where Date1 >= '4/5/2012' and Date1 <= '4/8/2012' and Employee_Name = 'XYZ'
Group by  Total_Hours, Date1, Employee_Name, Travel_Time

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Author Comment

by:BKennedy2008
ID: 37806254
Sach- That produces nothing, I tried that one.

WSShark- yours almost does the trick, I just need to add somewhere the where:

where a.Date1 >= '4/5/2012' and a.Date1 <= '4/8/2012' and a.Employee_Name = 'xyz'
0
 

Author Comment

by:BKennedy2008
ID: 37806278
your the man WShark83, thanks for the quick response!


SELECT a.Transaction_DateTimestamp, a.Total_Hours, a.Date1, a.Employee_Name, a.Travel_Time
from GrooveImports a  
join  (SELECT     date1, MAX(Transaction_DateTimeStamp) AS Expr1
         FROM          GrooveImports
         Group by date1) b
on a.date1 = b.date1
and a.Transaction_DateTimeStamp = b.expr1
and a.employee_Name = 'xyz' and a.Date1 >='4/1/2012' and a.date1 <='4/6/2012'
0
 
LVL 6

Expert Comment

by:wshark83
ID: 37806291
nps glad to be able to help.....
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