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%E3%81%A7CASE-WHEN-ELSE%E6%96%87%E3%82%92%E4%BD%BF%E7%94%A8%E3%81%99%E3%82%8B%E6%96%B9%E6%B3%95-01.jpg "しがないプログラマーの備忘録: PostgreSQのストアドファンクション(PL-pgSQL)でCASE-WHEN-ELSE文を使用する方法")