List/Grid Tag Archives: Databases

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Lesser-Known SQL Features: DEFAULT VALUES

A lesser-known SQL feature is the DEFAULT keyword, which can be used in INSERT and UPDATE statements. Consider the following table, created using standard SQL syntax:                   CREATE ...
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MongoDB “Lightning Fast Aggregation” Challenged with Oracle

What does “Scale” even mean in the context of databases? When talking about scaling, people have jumped to the vendor-induced conclusion that:SQL doesn’t scale NoSQL scalesIt ...
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Counting Distinct Records in SQL

The SQL language and its depths… Some of you readers might be aware of MySQL’s capability of counting distinct records through the COUNT() aggregate function. The MySQL documentation ...
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Add LATERAL Joins or CROSS APPLY to Your SQL Tool Chain

The T-SQL dialect has known the powerful CROSS APPLY and OUTER APPLY JOIN syntaxes for ages. The SQL:1999 standard had introduced almost equivalent “lateral derived tables”, which ...
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Using SQL Injection Vulnerabilities to Dump Your Database

The threat caused by SQL injection is heavily underestimated even by many senior developers and software architects. Most people are unaware of the fact that an entire server can be ...
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JOOQ Facts: From JPA Annotations to JOOQ Table Mappings

JOOQ is a neat framework, and it addresses a long issue I’ve had with advanced dynamic filtered queries. While Hibernate and JPA come with a useful Criteria API, which I’ve been ...
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Multi-tier application + database deadlock or why databases aren’t queues (part1)

Databases aren’t queues. And despite the ubiquitous presence of queuing technology out there (ActiveMQ, MSMQ, MSSQL Service Broker, Oracle Advanced Queuing) there are plenty of ...
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Why Staying in Control of Your SQL is so Important

Lots of blog posts and research papers are written about the topics of scaling up and scaling out. This interesting blog post, for instance, sheds some light on the two strategies with ...
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The 10 Most Popular DB Engines (SQL and NoSQL)

How to objectively measure the popularity of a DB engine? Good question! And there’s an Austrian company (Solid IT) who claims to have the answer. The company focuses on “Big Data ...
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Why PostgreSQL is so Awesome

Just recently, I’ve blogged about PostgreSQL 9.3 having been released, which is awesome enough as PostgreSQL finally supports materialised views and updatable views. I have then blogged ...
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