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Slow data retrieval
Message
From
18/07/2008 08:14:50
 
General information
Forum:
Microsoft SQL Server
Category:
SQL syntax
Environment versions
SQL Server:
SQL Server 2005
Miscellaneous
Thread ID:
01332178
Message ID:
01332197
Views:
9
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? If the first 1 is not correct then why SQL accepts it?
2. I am overusing LEGT OUTER JOINs what's the alternet?
3. Everytime i format the query and save it in View Desigener and reopen It looses my format.




>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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