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| Target | News |
| Subject | JOINよりIN (2) |
| Summary | 「INと比較すべきは、LEFT JOIN（外部結合）ではなく、INNER JOIN（内部結合）だ」という指摘を、Marijuanaさんから受けました。確かにその通りでしたので、あらためてベンチマークを行ってみました。その結果、NULL処理が増えた場合のLEFT JOINが極端に遅いだけで、INNER... |
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