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Displaying posts with tag: Tech (reset)

Including Code Samples With rst2pdf
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Every document I create these days is written in rst (ReStructuredText) and transformed into something useful using rst2pdf. This includes worksheets, reports, handouts and slide decks. Along the way I've learned a few tricks, and I try to write them down so I can look up how to do something. If this helps you too, then great :)

Start Simple

Include a code block in rst by adding something like this:


.. code-block:: php

Your code must then be indented, and the style persists until …



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From MySQL to MailChimp via CSV
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Don't you hate disclaimers? I do, but before I do anything else, I must ask that you don't use the techniques below unless you are emailing responsibly.

Today I needed to pull email addresses for people who had signed up to a thing out of MySQL and into MailChimp so that I could actually email them about the thing. MySQL actually has a very cute feature for exporting the results of an SQL query as a CSV file, which I had to look up to remember how to do it. It goes something like this:

My original query*

SELECT u.username, u.email, a.account_name …
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Handling Database Failover at Craigslist
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There has been some interesting discussion on-line recently about how to handle database (meaning MySQL, but really it applies to other systems too) failover. The discussion that I’ve followed so far, in order, is:

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SQL JOINing a Table to Itself
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Getting two sets of information from one table in a select statement often leads people to write subselects, but it really doesn't matter that this is the same table twice, we can just give it a new alias and treat it as if it were a different table. This is one of those techniques where, once you've seen it, it's really obvious, but until that point it can be very confusing. I explained this to someone else recently, so I thought I'd capture it here in case it's helpful to anyone else.

Consider that tried-and-tested example: employees and managers. Here's the staff table from the database (today's imaginary data isn't particularly …

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Linux Documentation Writer Wanted!
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The Oracle Linux and Virtualization Documentation Team is seeking an experienced Technical Writer
with a focus on writing documentation for the Oracle Linux product. (The MySQL Documentation Team is part of that group as well.)

Applicants should be located in either Ireland, the UK, …


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Linux Documentation Writer Wanted!
Employee +0 Vote Up -0Vote Down

The Oracle Linux and Virtualization Documentation Team is seeking an experienced Technical Writer
with a focus on writing documentation for the Oracle Linux product. (The MySQL Documentation Team is part of that group as well.)

Applicants should be located in either Ireland, the UK, …


  [Read more...]
SQL Joins with On or Using
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I recently wrote a post about inner and outer joins, and a couple of people asked what the difference is between USING and ON.

In a nutshell, you use ON for most things, but USING is a handy shorthand for the situation where the column names are the same.

Consider this example dataset:

mysql> select * from pets;
+---------+---------+--------+-----------+
| pets_id | animal  | name   | owners_id |
+---------+---------+--------+-----------+
|       1 | fox     | Rusty  | …
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Inner vs Outer Joins on a Many-To-Many Relationship
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Someone will probably tell me that this is an elementary-level topic, but I got some good questions regarding joins from my most recent ZCE class students, so I thought I'd put down the examples that I used to explain this to them. Being able to join with confidence is a key skill, because it means that you can refactor and normalise your data, without worrying about how hard something will be to retrieve.

The database structure I'm using here looks like this (the same example that I used when I wrote the Databases chapter for PHP Master):



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Explaining MySQL's EXPLAIN
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The MySQL explain plan is a great tool to help developers and database administrators to improve the performance of specific queries happening against a database. It is very easy to use, but its output can be confusing, so I thought I'd show a very simple example.

Let's begin by looking at a table called recipes

mysql> desc recipes;
+-------------+--------------+------+-----+---------+----------------+
| Field       | Type         | Null | Key | Default | Extra          |
+-------------+--------------+------+-----+---------+----------------+
| id          | int(11)      | NO   | PRI | NULL    | auto_increment |
| name        | varchar(400) | …
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Welcome to Insatiable Demand
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In early 2006 Paul Hurley (ideeli’s CEO) and I (Mark Uhrmacher, CTO) were thinking about a new business. We had the idea to create a community based around great deals for Women’s fashion products where we saw a great deal of potential for great content and product sales. Now, over five years later, we’ve realized much of that vision. Our business success has been chronicled over the years in several places (see here and here). Though we’re very proud of our achievements there, that …

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Showing entries 1 to 10 of 55 10 Older Entries

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