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Any way to rerwirte this query? Expand / Collapse
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Posted Tuesday, January 7, 2014 10:13 AM
Old Hand

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My udf needs to be the first statement in the query and then there is a left join to a table. How can I rewrite this?

I know if table is first statement and udf is a second statement in the join, we can simply pass the col from first table to the udf

But I am confused on this one.

Please help

select
From dbo.udf_Myfunction(a.col1) udf
LEFT JOIN mytable a on udf.col = a.col1
Post #1528573
Posted Tuesday, January 7, 2014 10:36 AM


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It makes no sense that your udf needs to come before your table if it uses a column from your table.
This might help you:
SELECT *
FROM mytable a
OUTER APPLY dbo.udf_Myfunction(a.col1) udf




Luis C.
Are you seriously taking the advice and code from someone from the internet without testing it? Do you at least understand it? Or can it easily kill your server?

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Post #1528580
Posted Tuesday, January 7, 2014 10:40 AM


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I am guessing that what you really want is all the rows from the function and values from the table if there is a match?

This is where you can turn your join around to a right join.

select *
From mytable a
RIGHT JOIN dbo.udf_Myfunction(a.col1) udf on udf.col = a.col1



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Post #1528583
Posted Tuesday, January 7, 2014 10:48 AM


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Sean Lange (1/7/2014)
I am guessing that what you really want is all the rows from the function and values from the table if there is a match?

This is where you can turn your join around to a right join.

select *
From mytable a
RIGHT JOIN dbo.udf_Myfunction(a.col1) udf on udf.col = a.col1


Hey Sean,
The parameter from the udf is a column from the table (I guess you didn't notice), so he would need to use APPLY. Even if a JOIN would be possible, RIGHT JOIN would make no sense as it shouldn't return any values not present on the table.



Luis C.
Are you seriously taking the advice and code from someone from the internet without testing it? Do you at least understand it? Or can it easily kill your server?

Forum Etiquette: How to post data/code on a forum to get the best help
Post #1528590
Posted Tuesday, January 7, 2014 10:55 AM


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Luis Cazares (1/7/2014)
Sean Lange (1/7/2014)
I am guessing that what you really want is all the rows from the function and values from the table if there is a match?

This is where you can turn your join around to a right join.

select *
From mytable a
RIGHT JOIN dbo.udf_Myfunction(a.col1) udf on udf.col = a.col1


Hey Sean,
The parameter from the udf is a column from the table (I guess you didn't notice), so he would need to use APPLY. Even if a JOIN would be possible, RIGHT JOIN would make no sense as it shouldn't return any values not present on the table.


/facepalm

I didn't notice the parameter was from the table.

I figured he wanted the values from the function and nulls when there was no match.

/me slithers away quietly hoping nobody will notice how awful his original suggestion was.


_______________________________________________________________

Need help? Help us help you.

Read the article at http://www.sqlservercentral.com/articles/Best+Practices/61537/ for best practices on asking questions.

Need to split a string? Try Jeff Moden's splitter.

Cross Tabs and Pivots, Part 1 – Converting Rows to Columns
Cross Tabs and Pivots, Part 2 - Dynamic Cross Tabs
Understanding and Using APPLY (Part 1)
Understanding and Using APPLY (Part 2)
Post #1528595
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