Archive for the ‘Ruby on Rails’ Category

How to use DISTINCT on a single column of a multi-column select statement

Saturday, December 6th, 2008

I recently came across this problem today of how to perform a SELECT DISTINCT but on a single column of a multi-column select statement. Imagine a database with a COUNTRIES table. The table contains a list of countries and there is also a "Nationality" column (eg. Australia is the country, ...

Posted in MySQL, Ruby on Rails, SQL Server | No Comments »

Understanding blocks in Ruby on Rails

Saturday, December 6th, 2008

Understanding how to use blocks in Ruby is crucial to leveraging the full power of this language. A block, known as a closure in programming theory, is basically just a method without a name, or an anonymous method. All methods in Ruby have the special ability to accept a block as ...

Posted in Ruby on Rails | No Comments »

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