Which column in an explain statement identifies the row identifier?

In an explain statement, the column that identifies the row identifier is the "id" column. The purpose of the "id" column is to provide a unique identifier for each row in the result set. This is crucial in understanding how data is organized and accessed within the database. Row identifiers are essential for querying, updating, and performing operations on specific records, making "id" a fundamental part of data management.

The other columns, while they may contain useful information about the data, serve different purposes. The "name" column typically represents the name or label of the entity, the "key" column may contain a unique attribute or combination of attributes that can be used as a secondary identifier, and the "type" column usually describes the data type of the records. However, none of these fulfill the unique identification role that the "id" column plays in the context of an explain statement.