cdx_akang的专栏

最近解决mysql慢查询问题，先把sql大概说明下 select id from table where type = 1 and XX= xx and XX1= xx1 and XX2 = xx2 order by time desc 再说一下背景，之前的开发人员建了两个索引 index_type和index_time， 结果mysql 一直是按照index_time索引...