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MySQLはインデックスされた文字列型カラムに数値型カラムをインデックスを使って結合できない - Qiita
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[MySQL] AUTO_INCREMENTカラム変更がめんどくさい・・ - Qiita![[MySQL] AUTO_INCREMENTカラム変更がめんどくさい・・ - Qiita](https://cdn-ak-scissors.b.st-hatena.com/image/square/053c15d76a5ad4aeb421b2890084c970a2da8caa/height=288;version=1;width=512/https%3A%2F%2Fqiita-user-contents.imgix.net%2Fhttps%253A%252F%252Fqiita-user-contents.imgix.net%252Fhttps%25253A%25252F%25252Fcdn.qiita.com%25252Fassets%25252Fpublic%25252Farticle-ogp-background-afbab5eb44e0b055cce1258705637a91.png%253Fixlib%253Drb-4.0.0%2526w%253D1200%2526blend64%253DaHR0cHM6Ly9xaWl0YS11c2VyLXByb2ZpbGUtaW1hZ2VzLmltZ2l4Lm5ldC9odHRwcyUzQSUyRiUyRnFpaXRhLWltYWdlLXN0b3JlLnMzLmFtYXpvbmF3cy5jb20lMkYwJTJGMzc1NDQlMkZwcm9maWxlLWltYWdlcyUyRjE0NzM2ODc0NjE_aXhsaWI9cmItNC4wLjAmYXI9MSUzQTEmZml0PWNyb3AmbWFzaz1lbGxpcHNlJmZtPXBuZzMyJnM9ZTVkNmRiOGViZGVhMWEwMmQ2MTZjNzJjYmFkMjcyM2E%2526blend-x%253D120%2526blend-y%253D467%2526blend-w%253D82%2526blend-h%253D82%2526blend-mode%253Dnormal%2526s%253Dabf62d9bce8012cc0fbc417957857773%3Fixlib%3Drb-4.0.0%26w%3D1200%26fm%3Djpg%26mark64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZ3PTk2MCZoPTMyNCZ0eHQ9JTVCTXlTUUwlNUQlMjBBVVRPX0lOQ1JFTUVOVCVFMyU4MiVBQiVFMyU4MyVBOSVFMyU4MyVBMCVFNSVBNCU4OSVFNiU5QiVCNCVFMyU4MSU4QyVFMyU4MiU4MSVFMyU4MiU5MyVFMyU4MSVBOSVFMyU4MSU4RiVFMyU4MSU5NSVFMyU4MSU4NCVFMyU4MyVCQiVFMyU4MyVCQiZ0eHQtYWxpZ249bGVmdCUyQ3RvcCZ0eHQtY29sb3I9JTIzMUUyMTIxJnR4dC1mb250PUhpcmFnaW5vJTIwU2FucyUyMFc2JnR4dC1zaXplPTU2JnR4dC1wYWQ9MCZzPTIwMTJmYjNjNWFmM2RiN2IyZWI1YmM3YmNkNDc4MGI3%26mark-x%3D120%26mark-y%3D112%26blend64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZ3PTgzOCZoPTU4JnR4dD0lNDBoaXQmdHh0LWNvbG9yPSUyMzFFMjEyMSZ0eHQtZm9udD1IaXJhZ2lubyUyMFNhbnMlMjBXNiZ0eHQtc2l6ZT0zNiZ0eHQtcGFkPTAmcz02NDk0YWNkZWM2YTY3NWY4OWJiMjdmMjNiM2FkYTM5Nw%26blend-x%3D242%26blend-y%3D480%26blend-w%3D838%26blend-h%3D46%26blend-fit%3Dcrop%26blend-crop%3Dleft%252Cbottom%26blend-mode%3Dnormal%26s%3De49be1601aac63457ca2934de6f3f67a)
