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adding initial draft of Quick SQL Tricks Guide #319

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adding initial draft of Quick SQL Tricks Guide #319

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michellechandra
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cc @ohasselblad

@michellechandra michellechandra self-assigned this Jun 10, 2016
Michelle Chandra added 2 commits June 10, 2016 14:19
@michellechandra
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hey @ohasselblad - let me know what you think of this initial draft and if I should add anything :)

Wondering if I should explain the WHERE operator? Casting? Alias? Etc?

andy-esch
andy-esch reviewed Jun 16, 2016
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_app/_sql-postgis/04-sql-tricks.md

The 'DB' part of CartoDB means that it is built on a database called [PostgreSQL](https://www.postgresql.org/docs/9.5/static/index.html). PostgreSQL's programming language is SQL, an acronym for structured query language, which is a powerful and popular language for analyzing tables of data. This reference guide provides several SQL queries and operations that you can easily use as part of your data analysis workflow. If you are new to SQL, first review lesson one of this series, [SQL and PostGIS in CartoDB Editor](https://academy.cartodb.com/courses/sql-postgis/intro-to-sql-and-postgis/).

## Basic Math Queries
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It would be nice to have an example dataset that you can use the whole way so people can follow along and produce some of the results.

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@michellechandra michellechandra Jun 16, 2016 •
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Cool, let me search the Data Library for an appropriate dataset

@andy-esch
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Nice list, @michellechandra 👍

A few thoughts:

  1. more crosslinking to our other resources (academy, tutorials)
  2. Yeah, basic WHERE would be cool, and could reference the first sql lesson. Talking about AND and OR logic would be nice as well.
  3. Yep, I like casting
  4. Yep, I like aliasing :)
  5. Measuring distances in meters (casting to ::geography type, could be good)

@michellechandra
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Was going to not review anything PostGIS related, would there be a way to discuss the geography type using just a SQL query that would be relevant? Or should that be saved for a different guide that is PostGIS tricks?

@andy-esch
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Good point, let's do a different guide on PostGIS

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