mysql8创建组合索引

https://wenku.baidu.com/view/63898d1d0a12a21614791711cc7931b764ce7b40.html?wkts=1668415162513&bdQuery=mysql8+%E7%BB%84%E5%90%88%E7%B4%A2%E5%BC%95

https://www.cnblogs.com/venchi/articles/16470917.html

创建联合索引