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Sarah Sproehnle
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  • San Jose, CA
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Sarah Sproehnle's Discussions

Misusing LEFT JOIN

SQL is definitely fun, unless it's not. ;) I've seen many cases where developers misuse a LEFT (or RIGHT) JOIN. Either they don't understand what an outer join is, or they needed an outer join at…Continue

Started Sep 11, 2009

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MySQL & Hadoop talk at Oracle Open World

I recently gave a talk about importing and exporting data between MySQL and Hadoop at Oracle Open World.  Here are the slides for that talk:


Posted on October 13, 2011 at 1:54pm

Hadoop for MySQL people

There's a lot of buzz lately about Hadoop. If you're completely new to Hadoop, I recommend the free videos from Cloudera (http://www.cloudera.com/resources/?type=Training). If you have a vague idea and want to play around, it's easy!

First, download Cloudera's training VM which has a small Hadoop cluster already installed and running:…

Posted on June 23, 2010 at 6:04pm

Sarah speaking at the 2010 MySQL User Conference

I'll be giving 2 talks this year. Here's a quick description:

Want Faster Queries?

Fixing slow queries is often very easy if you know what to look for and it can give huge performance gains. In this talk I'll cover common SQL mistakes, how to identify "bad" queries, indexing techniques, using EXPLAIN to verify execution plan, etc.…


Posted on February 22, 2010 at 4:27pm

Data type confusion: what is an int(11)?

Over and over I see customers that don't understand what int(11) really means. Their confusion is understandable. Many know what defining a char(10) means (a fixed-sized character string that allows up to 10 characters). However, ints are different.

First of all, there are 5 types of integer. They are all fixed size.

Type # of…

Posted on October 30, 2009 at 8:04pm — 1 Comment

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At 12:32pm on September 22, 2009, Lakshmi said…
Hey Sarah, interesting blog posts!


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