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Posted by David Portas on 12/28/05 01:50
Danielle wrote:
> Hello group-
> I am having a problem where joined tables are returning too many rows.
> Here is my scenario -
>
> I am trying to create a temporary table from parts of three tables -
> the important columns are:
>
> a.id
> a.tran_date
>
> b.id
> b.geo
>
> c.holiday_date
> c.geo
>
> My query is like this
>
> select a.col1, b.col1 from a
> inner join b on a.id = b.id
> inner join c on c.geo = b.geo
>
>
> With the parameters that I have, I get 144 rows with just the join of
> tables a & b.
>
> However, when I add the join to table c, I get 720 rows - there are (of
> course) 5 rows in table c where the geo is the same as the geo in table
> b.
>
> The reason for the join is that I need to know if a.tran_date =
> c.holiday_date and holidays differ by GEO.
>
> I don't want this added information. Thoughts on what I am doing wrong?
>
> Please let me know if you need more information
>
> Thanks-
> Danielle
Please post DDL and sample data, otherwise any answers you get will
just be guesswork. See:
http://www.aspfaq.com/etiquette.asp?id=5006
My guess is that you can use EXISTS or NOT EXISTS instead of a JOIN to
C. Your spec is too vague for me to be sure though.
--
David Portas
SQL Server MVP
--
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