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…

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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…

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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…

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Hibernate Facts: Always check Criteria API SQL queries

Criteria API is very useful for dynamically building queries, but that’s the only use case where I’d use it. Whenever…

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ID Lists Aren’t the Best Solution for the N+1 Problem

In their eternal attempts to circumvent the N+1 problem, Hibernate users often resort to IN predicates with ID lists. In…

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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…

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SQL Trick: row_number() is to SELECT what dense_rank() is to SELECT DISTINCT

The SQL:2003 standard ranking functions are awesome companions and useful tools every now and then. The ones that are supported in…

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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…

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The Premature Return to SQL

In online communities, the NoSQL topic (much like the ORM topic) is a guarantee to stir emotions. Many emotions are…

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