Set Operations in the Unix Shell
A while ago I wrote about how I solved the Google Treasure Hunt Puzzle #4 about prime numbers. I took an unusual approach and solved this problem entirely from the Unix shell. The solution involved finding the intersection between a bunch of files containing numbers. This lead me to an idea to write a post about how to do various set operations from the shell by using common utilities such as sort
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1:nなデータを検索しやすくDBに入れたい (2008-03-20)
手元に資料があるもので適当に問題を置き換えたので例が悪いが、とにかくこういうデータをどういうスキーマで格納するかを考える。教科書どおりに沿って考えると、このデータは正規化されていないので、正規形に変える必要があるだろう。 夜行バス ID名前行き先片道運賃 1
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