The Complex Computed Column

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The Complex Computed Column

Steve Jones - SSC Editor

SSC Guru

Points: 736173
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October 22, 2019 at 12:00 am

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Michael Lysons SSCertifiable Points: 6491 More actions · Answer 1

This took me down a rabbit hole of computed column research. I ended up finding the answer in one of your blog posts from 2011!

Now I'm wondering if computed columns might be useful in my data warehousing world.

So a good question, thank you 🙂

Steve Jones - SSC Editor SSC Guru Points: 736173 More actions · Answer 2

Glad you liked it. If you find a good, specific use, would love a short 1-2 page article on the way you use a computed column. Always good to help others think with a specific scenario.

MVDBA (Mike Vessey) SSC-Insane Points: 21797 More actions · Answer 3

damnit... I use these almost every day and I still got it wrong (I don't cheat and run the code)

we use persisted computed columns in so many areas - one of the key ones is address labels

if we insert a customer using the format

firstname, lastname, house number, streetname, city, county, postcode

what's the point in having a function that concatenates those values with line endings... a customer will have many orders (our customers are commercial - one of them has put millions of orders through)

so you create a persisted computed column that stores a pre-formatted address label - "WORM" write once , read many

we do the same thing with stock value - qty*price there's no point calculating it over and over again

MVDBA

Stewart "Arturius" Campbell SSC Guru Points: 72624 More actions · Answer 4

Nice question, thanks Steve

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