「ガチャ」のDB設計

https://thousand-tech.blog/database/%e8%a8%ad%e8%a8%88%e4%be%8b/%e3%80%8c%e3%82%ac%e3%83%81%e3%83%a3%e3%80%8d%e3%81%aedb%e8%a8%ad%e8%a8%88/

https://thousand-tech.blog/database/%e8%a8%ad%e8%a8%88%e4%be%8b/%e3%80%8c%e3%82%ac%e3%83%81%e3%83%a3%e3%80%8d%e3%81%aedb%e8%a8%ad%e8%a8%88-%e7%a2%ba%e7%8e%87%e3%81%82%e3%82%8a/

https://thousand-tech.blog/database/%e8%a8%ad%e8%a8%88%e4%be%8b/%e3%80%8c%e3%82%ac%e3%83%81%e3%83%a3%e3%80%8d%e3%81%aedb%e8%a8%ad%e8%a8%88-%e3%82%b0%e3%83%ac%e3%83%bc%e3%83%89%e7%a2%ba%e7%8e%87/