About Lukas Eder

Lukas is a Java and SQL enthusiast developer. He created the Data Geekery GmbH. He is the creator of jOOQ, a comprehensive SQL library for Java, and he is blogging mostly about these three topics: Java, SQL and jOOQ.

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SQL Tip of the Day: Be Wary of SELECT COUNT(*)

Recently, I’ve encountered this sort of query all over the place at a customer site:                     DECLARE v_var NUMBER(10); BEGIN ...
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Are You Using SQL PIVOT Yet? You Should!

Every once in a while, we run into these rare SQL issues where we’d like to do something that seems out of the ordinary. One of these things is pivoting rows to columns. A recent ...
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The 10 Most Annoying Things Coming Back to Java After Some Days of Scala

So, I’m experimenting with Scala because I want to write a parser, and the Scala Parsers API seems like a really good fit. After all, I can implement the parser in Scala and wrap ...
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Top 10 Very Very VERY Important Topics to Discuss

Some things are just very very very VERY very important. Such as John Cleese. The same is true for Whitespace:                Yes. 1080 Reddit ...
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Using Oracle AQ in Java Won’t Get Any Easier Than This

As recently announced in our newsletter, the upcoming jOOQ 3.5 will include an awesome new feature for those of you using the Oracle database: Native support for Oracle AQ! And your ...
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Keeping things DRY: Method overloading

A good clean application design requires discipline in keeping things DRY: Everything has to be done once. Having to do it twice is a coincidence. Having to do it three times is a pattern. — ...
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Java 8 Friday: More Functional Relational Transformation

In the past, we’ve been providing you with a new article every Friday about what’s new in Java 8. It has been a very exciting blog series, but we would like to focus again more ...
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PostgreSQL’s Table-Valued Functions

Table-valued functions are an awesome thing. Many databases support them in one way or another and so does PostgreSQL. In PostgreSQL, (almost) everything is a table. For instance, we ...
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Flyway and jOOQ for Unbeatable SQL Development Productivity

When performing database migrations, we at Data Geekery recommend using jOOQ with Flyway – Database Migrations Made Easy. In this post, we’re going to look into a simple way to ...
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Java 8 Friday: 10 Subtle Mistakes When Using the Streams API

At Data Geekery, we love Java. And as we’re really into jOOQ’s fluent API and query DSL, we’re absolutely thrilled about what Java 8 will bring to our ecosystem. Java 8 Friday Every ...
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