摘要: 索引合并优化 官网翻译 MySQL5.7文档 索引合并是为了减少几个范围(type中的range类型:range can be used when a key column is compared to a constant using any of the =, <>, >, >=, <, <=, 阅读全文
posted @ 2015-12-14 23:13 halu126 阅读(848) 评论(0) 推荐(0)