Obtaining unique records

I am trying to build a query using two tables. One is a table called sanctuary lakes cleaning data. The other one is called Faulire data. In cleaining table there are four years of cleaning records for each pit. I want to find the performance of these cleaned pits using failure table. Each failure date should have only one correspoding cleaning date. I wrote the following query. This query works. But it gives duplicate data. Some of the records will show two cleaning dates for a failure.
My query is like this.
SELECT DISTINCTROW [Sanctuary Lakes cleaning data].PIT, [Sanctuary Lakes cleaning data].[Cleaned Year], [Sanctuary Lakes cleaning data].[Cleaning Date], [Sanctuary Lakes cleaning data].[SR NO], [Failure data table].[Failure Year], Min([Failure data table].Failure_date) AS MinOfFailure_date, [Failure data table].[Failure SR no]
FROM [Failure data table] LEFT JOIN [Sanctuary Lakes cleaning data] ON [Failure data table].Pit = [Sanctuary Lakes cleaning data].PIT
GROUP BY [Sanctuary Lakes cleaning data].PIT, [Sanctuary Lakes cleaning data].[Cleaned Year], [Sanctuary Lakes cleaning data].[Cleaning Date], [Sanctuary Lakes cleaning data].[SR NO], [Failure data table].[Failure Year], [Failure data table].[Failure SR no]
HAVING (((Min([Failure data table].Failure_date))>Min([Sanctuary Lakes cleaning data]![Cleaning Date])))
ORDER BY [Sanctuary Lakes cleaning data].PIT;
My results are as follows:
PIT     Cleaned Year     Cleaning Date     SR NO     Failure Year          Failure_date          Failure SR no
1-08     2007/08          16-Oct-07          213458     2011/12          13-Aug-11          414984
1-08     2007/08          16-Oct-07          213458     2011/12          25-Jun-12          478589
1-08     2009/10          19-May-10          313497     2011/12          13-Aug-11          414984
1-08     2009/10          19-May-10          313497     2011/12          25-Jun-12          478589
1-08     2010/11          22-Feb-11          379081     2011/12          13-Aug-11          414984
1-08     2010/11          22-Feb-11          379081     2011/12          25-Jun-12          478589
1-08     2011/12          17-Apr-12          458430     2011/12          25-Jun-12          478589
I want the following results.
PIT     Cleaned Year     Cleaning Date     SR NO     Failure Year          Failure_date          Failure SR no
1-08     2010/11          22-Feb-11          379081     2011/12          13-Aug-11          414984
1-08     2011/12          17-Apr-12          458430     2011/12          25-Jun-12          478589
How can I modify my query?
Please help.
thanks
Nish

there is nothing wrong with distinct , i just want know alternative approch.
thank u very mach.

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Regarding Unique record

Hi,
How can i reduce time to count and display unique record from a table .
I have tested with DISTINCT but it takes more time to execute.
kindly give me optimize way to create query.

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HOW TO: Post a SQL statement tuning request - template posting
When your query takes too long:
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Obtaining unique records

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