一般来说，索引扫描是访问数据的最有效的方法，尤其是表很大但符合条件的行很少的时候。

Index scans are usually the most efficient way to access data, especially when the table is large but the number of qualified rows is small.

youdao

一般来说，索引扫描是访问数据的最有效的方法，尤其是表很大但符合条件的行很少的时候。

Index scans are usually the most efficient way to access data, especially when the table is large but the number of qualified rows is small.

youdao