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SQL Query is taking long time to run

Posted By:      Posted Date: October 13, 2010    Points: 0   Category :Sql Server

Hi All,
SQL Query is taking long time to run in my report. It is using Clustered index seek when I am querying for 2 days on invoice_itemized table. It is returning 99 thousand records. It is returning  2524094 records and it is using clustered index scan when I am querying for one month. For one month It is taking 7 minutes.
Basically it is not using the index defined for the store_Id, status and datetime columns in the invoice_totals table. Can I force the sql query to use the specified index?

Please suggest me to improve the performance....

SQL Query

,Invoice_Totals.DateTime InvoiceDate
,Invoice_Totals.Discount InvDiscPercent
,Invoice_Itemized.LineDisc LineDiscPercent
WHEN Invoice_Totals.Total_Price <> 0 AND Inventory.ItemType=7 AND Invoice_Totals.Discount = 0 THEN ((Invoice_Itemized.PricePer * Invoice_Itemized.Quantity) * -1) / ((Invoice_Totals.Total_Price) + ((Invoice_Itemized.PricePer * Invoice_Itemized.Quantity) * -1))
WHEN Invoice_Totals.Total_Price <> 0 AND Inventory.ItemType=7 THEN ((Invoice_Itemized.PricePer * I

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