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Get the max Time

Posted on 2009-04-15
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Last Modified: 2013-11-25
Hi

I have a query that inserts and updates all records from a temp table.

The problem I am having is that there are some fields that are identical, the only thing that makes them different is the time field.

I want to update all records with the latests time field from my temp table to my live table

The query I am running is below, as you can see the time is a varchar and then I update it to a date and time when I import the data into the table

CREATE PROCEDURE sp_InsertNAVData
	@CreateDate as DateTime
AS
 
BEGIN
  SET NOCOUNT ON
 
	---Update the NAV Information if it exists already overweite NAV, Shares, Price ---
	UPDATE  tblClassNAV 
	
		SET 
			tblClassNAV.TotalNAV = NTemp.NAV,
			tblClassNAV.TotalShares = NTemp.Quantity,
			tblClassNAV.SharePrice = NTemp.UnitPrice,
			tblClassNAV.ClassCCY = NTemp.ShareCCY,
			tblClassNAV.ClassUnitPrice = NTemp.UnitPrice_CCY,
			tblClassNAV.ClassRate = NTemp.FXRate,
			tblClassNAV.CCY = NTemp.CCY,
			tblClassNAV.Consolidated = NTemp.Consolidated,
			tblClassNAV.FundName = NTemp.FundName,
			tblClassNAV.ISIN = NTemp.ISIN,
			tblClassNAV.PreviousPrice = NTemp.PreviousPrice,
			tblClassNAV.TNA = NTemp.TNA,
			tblClassNAV.UpdatedDate = @CreateDate
 
 
		FROM 
			tblNAV_Temp AS NTemp 
			INNER JOIN tblClassNAV  
			ON NTemp.FundCode = tblClassNAV.FCode
			AND NTemp.CShare = tblClassNAV.FSCode
			AND NTemp.NAVDate = tblClassNAV.NAVDATE
                                      
	INSERT INTO 
			tblClassNAV 
			(FCode, FSCode, NAVTime, NAVDate, MonthID, TotalNAV, TotalShares, SharePrice, 
			ClassCCY, ClassUnitPrice, ClassRate, CCY, Consolidated, 
			FundName, ISIN, PreviousPrice, TNA, CreateDate)
	
	SELECT 	DISTINCT
			tblNAV_Temp.FundCode, 
			tblNAV_Temp.CShare, 
			Cast(tblNAV_Temp.NAVDate + Case when Len(Cast(NAVTime as varchar(6)))=6 Then 
			Left(Cast(NAVTime as varchar(6)),2)
			+':'+ Right(Cast(NAVTime as varchar(4)),2)
			+':'+ Right(Cast(NAVTime as varchar(6)),2)		
			END AS DateTime) as 'NAVTime',
			tblNAV_Temp.NAVDate, 
			tblNAV_Temp.MonthID,
			tblNAV_Temp.NAV,
			tblNAV_Temp.Quantity,
			tblNAV_Temp.UnitPrice,
			tblNAV_Temp.ShareCCY,
			tblNAV_Temp.UnitPrice_CCY,
			tblNAV_Temp.FXRate,
			tblNAV_Temp.CCY, 
			tblNAV_Temp.Consolidated, 
			tblNAV_Temp.FundName, 
			tblNAV_Temp.ISIN, 
			tblNAV_Temp.PreviousPrice, 
			tblNAV_Temp.TNA,
			CreateDate = @CreateDate
 
	FROM  
		tblNAV_Temp 
	WHERE 	
	 	NOT EXISTS 
	(SELECT * FROM 
		tblClassNav
 	WHERE 
		tblNAV_Temp.FundCode = tblClassNAV.FCode 
	AND 	tblNAV_Temp.CShare = tblClassNAV.FSCode
	AND	tblNAV_Temp.NAVDate = tblClassNAV.NAVDate)
	
END 
 
GO

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Question by:ITHELPME
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3 Comments
 
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Accepted Solution

by:
bprojoe earned 125 total points
ID: 24148406
After looking at your code and comments I would suggest that the issue is the database structure.  In order to efficiently update related records and add new ones you should have some kind of primary key(s).  If you are linking with three fields and you get identical records then you probably need to add a primary key field on each table.  This way when you do your insert, any record in the temp table that doesnt have a corresponding key in the live table is a new record.  Just remember to use identity insert when doing the insert so to keep the original key from the temp table.
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Author Comment

by:ITHELPME
ID: 24148745
Thanks for your comment,
I have the primary keys set FundCode, ShareCode and NAVDate this is within my join

The insert part of it works it is not linking when I want to do an update.

I have tried the below, this gives me the correct result I am looking for but when I put the full thing together in the update section it will not get me the max time only I think it is because the prices are different

How do I get around this if some fields are different, I only want it to select the distinct values where there are more than one use the Time field to get the latest


SELECT  
			tblNAV_Temp.FundCode,
			tblNAV_Temp.CShare,
			tblNAV_Temp.CCY,
			tblNAV_Temp.Consolidated, 
			tblNAV_Temp.FundName,
			tblNAV_Temp.NAVDate,
			tblNAV_Temp.MonthID,
			tblNAV_Temp.ISIN,
			tblNAV_Temp.PreviousPrice,
			--tblNAV_Temp.Quantity,
			--tblNAV_Temp.UnitPrice,
			--tblNAV_Temp.NAV,
			--tblNAV_Temp.TNA,
			MAX(tblNAV_Temp.NAVTime) as 'NAV Time'
				
		FROM  
			tblNAV_Temp
		group by 
			tblNAV_Temp.FundCode, 
			tblNAV_Temp.CShare,
			tblNAV_Temp.CCY,
			tblNAV_Temp.Consolidated, 
			tblNAV_Temp.FundName,
			tblNAV_Temp.NAVDate,
			tblNAV_Temp.MonthID,
			tblNAV_Temp.ISIN,
			tblNAV_Temp.PreviousPrice

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Author Closing Comment

by:ITHELPME
ID: 31570372
Thank you for your help
The problem was there was a trigger which was preventing the update.  Once I deleted the trigger it all worked fine, I had tested it on the test server and all worked from there but triggers do not copy accross when you copy the table, learn something new every day, thanks again
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