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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jOOQ Tuesdays: Yalim Gerger brings Git to Oracle

We’re excited to launch a new series on our blog: the jOOQ Tuesdays. In this series, we’ll publish an article on the third Tuesday every month where we interview someone we find ...
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Really Too Bad that Java 8 Doesn’t Have Iterable.stream()

This is one of the more interesting recent Stack Overflow questions: Why does Iterable not provide stream() and parallelStream() methods? At first, it might seem intuitive to make it ...
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The Inconvenient Truth About Dynamic vs. Static Typing

Sometimes there are these moments of truth. They happen completely unexpectedly, such as when I read this tweet: Good discussion of Facebook Flow – http://t.co/5KTKakDB0w — ...
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Do You Really Understand SQL’s GROUP BY and HAVING clauses?

There are some things in SQL that we simply take for granted without thinking about them properly. One of these things are the GROUP BY and the less popular HAVING clauses. Let’s ...
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How to Integrate Commercial Third-Party Artefacts into Your Maven Build

According to a recent survey by ZeroTurnaround’s RebelLabs, Maven is still the leading Java build platform. The current market share distribution, according to RebelLabs is:                Maven ...
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Use MySQL’s Strict Mode on all new Projects!

MySQL is a database that has been bending the SQL standard in ways that make it hard to move off MySQL. What may appear to be a clever technique for vendor lockin (or maybe just oversight ...
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Don’t Miss out on Awesome SQL Power with FIRST_VALUE(), LAST_VALUE(), LEAD(), and LAG()

If you’re using a commercial database or PostgreSQL / Firebird / CUBRID, you will be able to take advantage of the full power of window functions. We’ve blogged about window functions’ ...
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Don’t Migrate to MariaDB just yet. MySQL is Back!

Now that I have your attention, I’d like to invite you to a critical review of where we’re at in the MySQL vs. MariaDB debate. Around one month ago, I visited Oracle Open World ...
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Painless Access from Java to PL/SQL Procedures with jOOQ

PL/SQL is one of those things. Most people try to stay clear of it. Few people really love it. I just happen to suffer from stockholm syndrome, since I’m working a lot with banks. Even ...
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Have You Ever Wondered About the Difference Between NOT NULL and DEFAULT?

When writing DDL in SQL, you can specify a couple of constraints on columns, like NOT NULL or DEFAULT constraints. Some people might wonder, if the two constraints are actually redundant, ...
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