Databases
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DevOps
MySQL error: Can’t connect to MySQL server
You may have stumbled on this MySQL error. If you have already seen this before, then it’s really easy to…
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Software Development
Yet Another 10 Common Mistakes Java Developers Make When Writing SQL (You Won’t BELIEVE the Last One)
(Sorry for that click-bait heading. Couldn’t resist!) We’re on a mission. To teach you SQL. But mostly, we want to…
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Software Development
MySQL Transaction Isolation Levels and Locks
Recently, an application that my team was working on encountered problems with a MySQL deadlock situation and it took us…
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Software Development
Seven Databases in Seven Weeks – Hbase Day 2
This post is a recap of the second day of Hbase from the Seven Databases in Seven Weeks book. Most…
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Software Development
SQL Server Trick: Circumvent Missing ORDER BY Clause
SQL Server is known to have a very strict interpretation of the SQL standard. For instance, the following expressions or…
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Software Development
The Index You’ve Added is Useless. Why?
Recently, at the office: Bob: I’ve looked into that slow query you’ve told me about yesterday, Alice. I’ve added the…
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Software Development
How to import CSV data into PostgreSQL
Introduction Many database servers support CSV data transfers and this post will show one way you can import CSV files…
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Software Development
How to Implement Sort Indirection in SQL
I’ve recently stumbled upon this interesting Stack Overflow question, where the user essentially wanted to ensure that resulting records are…
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Software Development
NoSQL? No, SQL! – How to Calculate Running Totals
If anything at all, our jOOQ talks at various JUGs and conferences have revealed mostly one thing: Java developers don’t…
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