它包括所使用的索引、从数据库表中检索字段的次数，以及执行查询的步骤的顺序。

It includes the indexes that are used, The Times at which fields are retrieved from the database tables, and the order of steps in which the query is executed.

youdao

它包括所使用的索引、从数据库表中检索字段的次数，以及执行查询的步骤的顺序。

It includes the indexes that are used, The Times at which fields are retrieved from the database tables, and the order of steps in which the query is executed.

youdao