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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.
Although they tell us that they want it real bad, our primary goal is to ensure that we dont actually give it to them that way.
Although change is inevitable, change for the better is not.
Just because you can do something in PowerShell, doesnt mean you should. Wink

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How to post code problems
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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
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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