taking too much time to retrieve data from MS Access Database

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Hi,
I am using MS Access database and below is the query I am using, but it taking too much of time (5min) to retrieve the data.

Please check and give some suggestions.

SQL

select distinct (a.customer) from customermaster as a,PMRegister as b where a.active='T' and a.sectorName='Jayanagar' and a.customer not in(select customer from PMRegister where active='T' and month(dt) <= month(cdate(1/12/2012)) and month(dt) >= month(cdate(11/12/2012)) and year(dt) <= year(cdate(1/12/2012)) and year(dt) >= year(cdate(11/12/2012)))  order by a.Customer

Posted 11-Dec-12 21:42pm

PRAKASH_N

Updated 11-Dec-12 21:45pm

André Kraak

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Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) · Answer 1 · 2012-12-11T23:07:00

Your query is taking so much time as there are many AND conditions.
And the main problem is not in() function which generally takes more time.
You should avoid that.

Instead of not in, try to INNER JOIN[^] the tables to fetch the data faster.

I am not using MS-Access. So, I am not sure whether the following query will work or not.

But I tried to optimize the query. Take a look.

SQL

SELECT DISTINCT (a.customer) 
FROM 
	customermaster as a
INNER JOIN 
	PMRegister as b
ON a.customer = b.customer
AND a.active = 'T'
AND a.sectorName = 'Jayanagar'
AND MONTH(dt) >= MONTH(cdate(11/12/2012)) 
AND YEAR(dt) <= YEAR(cdate(1/12/2012)) 
AND YEAR(dt) >= YEAR(cdate(11/12/2012)))
 
ORDER BY a.Customer

I may be wrong. Please try to implement INNER JOIN and eliminate the extra conditions as far as possible.

Thanks...