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sql get latest unique

Posted on 2011-03-25
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Last Modified: 2012-06-21
what to retrieve a unique count of records ... when an db update is processed an new copy of the record is actioned (to preserve this historic data) ... so for example, the same account details may appear 3 or 4 times already ...but only want to count the latest copy.

there is also a DateTimeStamp column available (when table created / add to db)
need to also group results by ColumnValue item (there will be a bunch of denominations) -- but the frequency each of those occur ... and then finally a grand total of Frequency at the bottom.

how do you script this in SQL please?


USE db1

SELECT COUNT(Index_ID) AS Frequency

FROM dbo.Table1
WHERE (MySearchCriteria_ID <> 123) AND .....
GROUP BY DenominationValue

then display at bottom:  GrandFreqTotal
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Question by:amillyard
2 Comments
 
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by:
lcohan earned 500 total points
ID: 35218557
Should be something like:


SELECT COUNT(distinct Index_ID) AS Frequency,SUM(GrandFreqTotal) as GrandFreqTotal
FROM dbo.Table1
WHERE MySearchCriteria_ID <> 123 AND .....
GROUP BY DenominationValue

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Author Comment

by:amillyard
ID: 35227464
SUM(GrandFreqTotal) as GrandFreqTotal

the above line is not compiling - is this because there is an assumption there is column in table called:   GrandFreqTotal

the group by list -- how do I also display the column label  (or custom label) -- as currently there is just a set of figures (not easy to work out what each line is a result for).

i.e. the unique column value to be display (currently, the frequency of that value is being displayed)
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