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How to create fast database queries

5 Claims About SQL, Explained

with 4 comments

1. Is SQL is a declarative language?

First of all, let's define the terms.

A declarative language describes the result, not the process to achieve it. In a declarative language you tell "what do I need".

A procedural language describes control flow: exact steps the machine needs to perform in order to achieve this result. In a procedural language you tell "what do you do".

SQL, as it was originally designed, is a declarative language.

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For instance you need to know how many customers above 40 live in each city. You issue a query like:

Read the rest of this entry on tech.pro ยป

Written by Quassnoi

October 28th, 2013 at 11:00 pm

Posted in Miscellaneous

4 Responses to '5 Claims About SQL, Explained'

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  1. Tech.Pro site link is not working and couldn’t access the article

    Manoj

    15 Sep 15 at 19:06

  2. @Manoj: seems they’re out of business

    Quassnoi

    15 Sep 15 at 19:12

  3. I thought the whole point of having your own website would be to actually have your own content there :) Maybe you could just update the link to the one from the Internet Archive? I found it: https://web.archive.org/web/20140327174756/http://tech.pro/tutorial/1631/5-claims-about-sql-explained

    Alternatively, just include the actual contents here :)

    Carl-Erik Kopseng

    28 Oct 20 at 13:44

  4. Unfortunately, it’s not my own content, I got paid for writing it and it belongs to whoever was running that site.

    Quassnoi

    28 Oct 20 at 19:23

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