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Intersect, Except, Union, All and Any


Intersect, Except, Union, All and Any

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David.Poole
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Comments posted to this topic are about the item Intersect, Except, Union, All and Any

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Jeff Moden
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I had similar feelings when PIVOT came out. Proves that "new" or "different" is frequently not better, faster, or easier to read. :-P

Good article David. Thanks for taking the time to write it and to do the comparisons.

--Jeff Moden

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WayneS
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Very good article David.

One area where I find INTERSECT / EXCEPT easier to work with is when dealing with multiple columns, such as what you might find for a PK. It would really be interesting to see a comparison between the different methods using multiple columns instead of just a single column.

Wayne
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Jeff Moden
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Why would anyone think that INTERSECT is easier than INNER JOIN?

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
If you think its expensive to hire a professional to do the job, wait until you hire an amateur. -- Red Adair

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How to post code problems
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Forum FAQs
Kim Vermeij
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Hey David,

Nice article, I think you'll find the advantage with EXCEPT when you have to compare multiple columns with possible null values on both sides. When you compare null values with a JOIN or a WHERE statement you will get a "wrong" result, when using the EXCEPT statement you will get the "right" result.

see also:http://en.wikipedia.org/wiki/Null_(SQL)#Grouping_and_sorting

Kim
richard-674310
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When I look at the article none of the images show up? I see no other comments in the forum - is it just me? For ex...
image001 gives me nothing
andrew.amess
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I get no images!!!
conradr
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No Images either. How Useful!!!
David McKinney
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Nice article!

I've used EXCEPT a few times recently - simply cos I could, I guess, and also sometimes (even if it's relatively unknown syntax) it is clearer when reading the code what is going on.

One limiting aspect of EXCEPT (and also INTERSECT - although I haven't used it) is that the columns have to match (like they do for a UNION) whereas with NOT IN / NOT EXISTS etc. there is no such restriction.
Noel McKinney
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Same here, no images, just the red x in a box.
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