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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, i.e. is it...
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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 2014, and I’ve met with...
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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 of the...
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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 look at a simple...
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jOOQ Tuesdays: Yalım 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 exciting in our...
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A True SQL Gem You Didn’t Know Yet: The EVERY() Aggregate Function
We’ve just added support for the EVERY() aggregate function (#1391) to jOOQ, and would like to take the opportunity of letting you know of this true SQL gem that can come in handy EVERY(now and then)...
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Are You Binding Your Oracle DATEs Correctly? I Bet You Aren’t
Oracle database has its ways. In my SQL talks at conferences, I love to confuse people with the following Oracle facts: … and the answer is, of course: Isn’t it horrible to make empty string the same...
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Leaky Abstractions, or How to Bind Oracle DATE Correctly with Hibernate
We’ve recently published an article about how to bind the Oracle DATE type correctly in SQL / JDBC, and jOOQ. This article got a bit of traction on reddit with an interesting remark by Vlad Mihalcea,...
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The Awesome PostgreSQL 9.4 / SQL:2003 FILTER Clause for Aggregate Functions
Sometimes when aggregating data with SQL, we’d love to add some additional filters. For instance, consider the following world bank data: GDP per capita (current US$) 2009 2010 2011 2012 CA 40,764...
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How to Emulate the MEDIAN() Aggregate Function Using Inverse Distribution...
Some databases are awesome enough to implement the MEDIAN() aggregate function. Remember that the MEDIAN() is sligthly different from (and often more useful than) the MEAN() or AVG() (average). While...
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Transform Your SQL Data into Charts Using jOOQ and JavaFX
In the recent past, we’ve shown how Java 8 and functional programming will bring a new perspective to Java developers when it comes to functional data transformation of SQL data using jOOQ and Java 8...
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How to Translate SQL GROUP BY and Aggregations to Java 8
I couldn’t resist. I have read this question by Hugo Prudente on Stack Overflow. And I knew there had to be a better way than what the JDK has to offer. The question reads: I’m looking for a lambda to...
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Still Using Windows 3.1? So why stick to SQL-92?
We’ve been blogging a lot about the merits of modern SQL on the jOOQ blog. Specifically, window functions are one of the most fascinating features. But there are many many others. Markus Winand, author...
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“NoSQL Injection”– What 40000 Unsecured MongoDB Databases Mean for our Industry
The news is all over reddit… Major security alert as 40,000 MongoDB databases left unsecured on the internet Security is a feature that is often neglected until it’s too late. And when it’s too late,...
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10 SQL Articles Everyone Must Read
We’ve been blogging about Java and SQL for a while now, on the jOOQ blog. Over the years, while researching interesting blog topics, we’ve discovered a lot of SQL gems in the blogosphere that have...
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jOOQ vs. Slick – Pros and Cons of Each Approach
Every framework introduces a new compromise. A compromise that is introduced because the framework makes some assumptions about how you’d like to interact with your software infrastructure. An example...
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How to Extract a Date Part in SQL
The Modern SQL Twitter account (by Markus Winand) published a hint about how to extract a date part in SQL: The right way to get a part of a date/time is: EXTRACT(YEAR FROM CURRENT_DATE) = 2015...
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How to use SQL PIVOT to Compare Two Tables in Your Database
This can happen ever so easily. You adapt a table by adding a new column: ALTER TABLE payments ADD code NUMBER(3); You go on, implementing your business logic – absolutely no problem. But then, later...
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jOOQ – Ein alternativer Weg mit Java und SQL zu arbeiten
We’ve published an article in the German magazine www.java-aktuell.de, which is published by the iJUG e.V.. You can read and download the article free of charge from our blog! In Java gibt es kein...
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Integrating jOOQ with Grails Featuring the UWS-jOOQ Plugin
Introduction Grails is a web framework aimed to boost development productivity. One of the main features is domain centric database schema generation. Applications built with Grails are able to update...
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