Solved

optimize where clause on a query

Posted on 2014-02-06
3
233 Views
Last Modified: 2014-02-15
Hello,

I have checked execution plan.
How can I optimize this query :
SELECT 
[SplitId],[PKey],[affId],[SalesKey]  ,[Trader]   ,[NetBro] ,[Ccy] ,[NetBroFuncCcy] ,[FuncCcy] ,[Side] ,[NetBroNoDiscount]
FROM   [dbo].[FI_Splits]
WHERE affDate<CAST(ROUND(CAST(getdate() AS float)-0.25,0)AS Datetime)
   and affDate > cast(   year(current_timestamp)-2 as char(4)) +'0101' 

Open in new window


Thanks
0
Comment
Question by:bibi92
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
3 Comments
 
LVL 70

Expert Comment

by:Éric Moreau
ID: 39838687
do you have an index on affDate?

have you tried casting the AND clause as a date?
CAST( cast(   year(current_timestamp)-2 as char(4)) +'0101' AS DATETIME)
0
 
LVL 65

Expert Comment

by:Jim Horn
ID: 39838763
For starters, the WHERE clause is doing a comparison with both a datetime and a character values?  That would mean implicit conversion, possibly for every row.

Better to do your formulas in scalar variables of the same data type, then refer to those variables in your WHERE clause.
0
 
LVL 69

Accepted Solution

by:
Scott Pletcher earned 500 total points
ID: 39839376
Cluster dbo.FI_Splits by affDate if that is how you typically query that table (instead of the existing cluster on the id/identity column).  Add a nonclustered index on the id/identity column if you actually use it to do lookups w/o specifying a small affDate range.

To avoid unwanted column conversions, use varchar values for both affDate comparison values:

...same as before...
WHERE affDate < CONVERT(char(8), CAST(ROUND(CAST(getdate() AS float)-0.25,0) AS Datetime), 112)...same as before...
0

Featured Post

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Slowly Changing Dimension Transformation component in data task flow is very useful for us to manage and control how data changes in SSIS.
Load balancing is the method of dividing the total amount of work performed by one computer between two or more computers. Its aim is to get more work done in the same amount of time, ensuring that all the users get served faster.
Familiarize people with the process of utilizing SQL Server functions from within Microsoft Access. Microsoft Access is a very powerful client/server development tool. One of the SQL Server objects that you can interact with from within Microsoft Ac…
Via a live example, show how to shrink a transaction log file down to a reasonable size.

740 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question