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Slow data retrieval
Message
De
18/07/2008 12:54:01
 
 
Information générale
Forum:
Microsoft SQL Server
Catégorie:
Syntaxe SQL
Versions des environnements
SQL Server:
SQL Server 2005
Divers
Thread ID:
01332178
Message ID:
01332325
Vues:
8
Thank you again Sergery.
You are a Star!



>>Thanks a lot. Sergey.
>>
>>I replaced
>>
ON m.f_year + m.type_code + m.sal_no = d.f_year + d.type_code + d.sal_no
>>with
>>
ON m.f_year = d.f_year AND m.type_code = d.type_code AND m.sal_no = d.sal_no
>>It changed everything. I got 6200 in just matter of seconds.
>>
>>1. What's the difference between them?
>
>I explained it in my prevous message.
>
>> If the first 1 is not correct then why SQL accepts it?
>
>It's valid expression but it's used incorrectly by you
>
>>2. I am overusing LEFT OUTER JOINs what's the alternet?
>
>Only use them when you have to
>
>>3. Everytime i format the query and save it in View Desigener and reopen It looses my format.
>
>I do not use View Desigener or Query Designer for that reason.
>
>>
>>
>>
>>>It seems that you're overusing LEFT OUTER JOINs. Do you really need all of them to be such?
>>>All JOIN expressions are incorrect. SQL Server does not have compound indexes so they cannot be optimized. The join should be on each column separately
>>>
>>>INNER JOIN dbo.sal_dtl AS d
>>> 	ON m.f_year + m.type_code + m.sal_no = d.f_year + d.type_code + d.sal_no
>>>
>>>-- should be
>>>
>>>INNER JOIN dbo.sal_dtl AS d
>>> 	ON m.f_year = d.f_year AND m.type_code = d.type_code AND m.sal_no = d.sal_no
>>>
>>>-- and so on
>>>
>>>
>>>I also would recommend to reformat the query for readability.
>>>
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