Inner Join Multiplies Results....

Oct 16, 2007



Hi, i guess u have run into it again..
I have 3 tables
Table 1 is holding word documents :
WordDoc
wd_id integer primary key
wd image

Table 2 is holding parts of the document in a master detail fashion as from one document we can create many parts of it.

WordPartDoc
wpd_id integer primary key
wpd_wd_id integer foreign key from WordDoc
wpd_part image


Table 3 holds the persons or groups to whom we have given a copy of a specific part.

PersonsCopiedAt
pca_id integer primarey key
pca_wpd_id integer foreing key from WordPartDoc
pca_pg_id integer this is the id of the table that holds the persons or the id of the table that holds the group
pca_p_or_g char(1) this is a flag : 'P' for a person, 'G' for a group

Now, here is my problem... I have created the following sql query
select wd_id, wpd_id
from wordDoc
inner join wordPartDoc on wpd_wd_id = wd_id
inner join PersonCopiedAt on pca_wpd_id = wpd_id
where pca_pg_id = someID and pca_p_or_g = 'G' --or 'P'

This works perfectly if a pca_pg_id is provided, but this is provided using a combobox... If the user doesn't select a person - and thus - no id is provided - inner join brings me as many records of wpd_id as the number of persons that were given a copy. I understand that this is the correct behaviour but in the later case (when no id is provided) i want only one record to be returned. Is there a way to do so ? do i have to redisign the db schema ?

thanx
theodore

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Hi,
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all fairly straightforward and works without a problem..

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Here is my statement:

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AS QtyReceived
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dbo.Suppliers_POs_Details_Received.Qty


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Select Command - Left Join Versus Inner Join

Aug 9, 2013

Why would I use a left join instead of a inner join when the columns entered within the SELECT command determine what is displayed from the query results?

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Merge Join (Full Outer Join) Never Finishes.

Jun 5, 2006

I have a merge join (full outer join) task in a data flow. The left input comes from a flat file source and then a script transformation which does some custom grouping. The right input comes from an oledb source. The script transformation output is asynchronous (SynchronousInputID=0). The left input has many more rows (200,000+) than the right input (2,500). I run it from VS 2005 by right-click/execute on the data flow task. The merge join remains yellow and the task never finishes. I do see a row count above the flat file destination that reaches a certain number and seems to get stuck there. When I test with a smaller file on the left it works OK. Any suggestions?

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Why Does My Query Timeout Unless Force Join To Hash Join?

Jul 25, 2007

I'm using SQL Server 2005.



A piece of software I wrote starting timing out on a query that left outer joins a table to a view. Both the table and view have approximately the same number of rows (about 170000).



The table has 2 very similar columns, one is a varchar(1) and another is varchar(100). Neither are included in any index and beyond the size difference, the columns have the same properties. One of the employees here uses the varchar(1) column (called miscsearch) to tag large sets of rows to perform some action on. In this case, he had set 9000 rows miscsearch value to "g". The query then should join the table and view for all rows where miscsearch is set to g in the table. This query takes at least 20 minutes to run (I stopped it at this point).

If I remove the "where" clause and join all rows in the two tables, the query completes in about 20 seconds. If set the varchar(100) column (called descrip) to "g" for the same rows set via miscsearch, the query completes in about 20 seconds.



If I force the join type to a hash join, the query completes using miscsearch in about 30 seconds.



So, this works:

SELECT di.File_No, prevPlacements, balance,'NOT PLACED' as status FROM Info di LEFT OUTER HASH JOIN View_PP pp ON di.ram_file_no = pp.file_no WHERE miscsearch = 'g' ORDER BY balance DESC



and this works:

SELECT di.File_No, prevPlacements, balance,'NOT PLACED' as status FROM Info di LEFT OUTER JOIN View_PP pp ON di.ram_file_no = pp.file_no WHERE descrip = 'g' ORDER BY balance DESC



But this does't:

SELECT di.File_No, prevPlacements, balance,'NOT PLACED' as status FROM Info di LEFT OUTER JOIN View_PP pp ON di.ram_file_no = pp.file_no WHERE miscsearch = 'g' ORDER BY balance DESC



What should I be looking for here to understand why this is happening?



Thanks,

john















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Page 2 - Within The INNER JOIN, How To Limit The Row To 1 Row Inside The INNER JOIN?

Apr 24, 2007

Awesome! I don't alway get the email notification of whoever reply to the posting. I think it only work after I log off of the forum.

Scott

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